I would like to see a 351w with max ported gt40heads, milled down, bigger valves, roller rocker conversion, good race valves, polished chambers, It would be nice to see what the combo would do if you were to do everything possible to the gt40 heads. I have looked all over the internet and no one has done a video on a truly maxed out set of gt40 heads its really disappointing!
@@timothywalker2273 problem is... as good as the internet is, you can't beat paperback..... I have kept over 30 years of street machine, zoom, fast ford, performance ford etc etc, and I can tell you that finding the 30 year old articles detailing the work involved from the guy's whom did this. Is worth it's weight in gold 👍
What it costs for a fully worked 240 cfm GT40 head you can buy aluminum. Many hours labor and flow benching. Vizard iron GT40/ E7TE heads are $4,000 ready to run. I think Charlie Servideo said $2,000 for just porting his.
@@hotrodray6802 I understand there's better cheaper ways these days but the look on someone's face when they underestimate you and you blow their doors off is priceless
@@sheldonbromen2603 Then definitely get DV iron heads and Big Dogs stage 3 original HO intake and ported 65mm and BD cam. Or even BD ported iron heads for less $. Look stock, make 400+ HP crank, and 340+ wheel.
I'm real impressed by my stock 94 mustang short block with milled (.040) gt40 heads, Alex springs, comp nx264hr cam (adv 4deg), Mac equal length headers, ported explorer lower stock explorer upper and tb. Streetability is very responsive and fun. Plus still 20mpgs.
I scored some NOS Two-Bar (Marine) GT40 heads. A friend ported them, removed the EGR bumps, cleaned up the slag on the OE headers (40% larger at flange!) added a ported E4 intake, a recurved distributor, and 1.7 SVO rockers to my '85. Woke it RIGHT up and nobody knows it's modded. :-)
Makes a LOT of low-end Torque, especially with a stock HO Mustang cam, if you have a 1994-up 5.8L roller block.... but runs out of airflow pretty quick as the RPM's climb. Great towing/torque engine, though.
I just got done doing this. Gt40p's from a 2001 Mountaineer. $39 each at my local yard. Ported them myself and had a friend mill them. Added an Alex's drop in spring kit and they work great! Awesome performance on a budget.
How much you can mill the head? Stock cam? Stock rocker arm ? I want to improve my explorer motor but i dont know how long i can go without stamping a valve in a pistón 🤣
You should redo this kind of test put upgrade the springs from the GT40/P heads. The engine is only designed to go to 5,000 rpm and you ended up with valve float
Running a 302 explorer swap from a running mountaineer I snagged for 400$ set up with a holley sniper is actually a pretty rowdy set up for my Miata swap. Haven’t done any dragy times but its all power to weight at this point for me
Thank you for all of your help and testing Richard. I just purchased a 351 from a guy last week. I’m looking for a set of gt40 heads now. The yard is out of them. I will let you know what I think of the set up when I get it in my foxbody vert next year.
Both 40 and 40p heads will need better valve springs for high rpm work but the biggest difference is the relocated spark plug and smaller exhaust valves on the 40p. Ford moved the plug for better fuel mixing and went with the smaller E7 size valves because the hardened seat inserts on the earlier GT40's were more expensive than induction hardening the seats on the p's. Ford made up for the smaller valves with a slightly better exhaust port on the latter heads. Both will support 375-400 hp with mild porting (mostly on the exhaust side) and the right cam but i think they more cost effective and durable for a 350 ish HP 302 400 HP 351 build.
Would you mind trying truck-oriented combinations for the 5.0/5.8? On this power/torque graph, none of the rpms plotted are relevant for a truck for towing, pulling its own heavy weight and offroading, where a truck needs a lot of torque in the lower rpms. Maybe 1000 to 4000 rpm gains? Stock intake versus Edelbrock? Stock heads versus GT40(p), AFR 165? Sorry if I'm asking for a lot. OBS Ford Bronco here.
GT40/GT40P heads on a 5.8L/351W (1996 in my F250) with a stock '88-'92 Mustang HO cam and longtube Hedman Hedders makes HELLA towing power with 4.10 gears! People will think you have a 460 under the hood! However... the stock 351W/5.8 EFI intake stops at around 4000-4500 rpm TOPS! (dual 3" Y-into a single 3" exhaust)
A 408W stroker engine with GT40/GT40P heads (watch your compression ratio!) and a stock HO Mustang cam will make torque almost comparable to a 460. The stock EFI 5.8 intake will be 100% done by 4000 RPM, though.
When you pick up the GT's make sure to snag an Explorer upper intake, it's actually a little big for your application but everything else is even bigger.
@@johnjones928 I thought the explorer upper intakes weren’t as good as the older 5.0 intakes from bronco’s and such for flow? I know the Frank-intake idea where you use a 351 lower with 302 truck upper ported and matched is the best oem thing you can do but I didn’t think the explorer intake was better?
Answering your question, depends on what you want or are using the motor for. If it’s just a Saturday cruiser and you’re on a budget, the GT40(p) heads are perfect. If you want more HP and invested in other mods to support added HP, then a good set of aluminum heads makes sense.
I have a 1989 crown Vic ltd with a 302 with 83k miles my motor idles high I’m guessing it needs a tune up for sitting so long it hesitates in gear Sometimes I’m trying to refurbish throw motor on stock block just rebuild all over it any advices or tips? I have videos up of me working on it slowly
Other than practical reasons like heavier vehical needs more power why the hell would ford put the crappier version of there 5.0 head on there flagship performance car?? You would think in the even then pony car wars ford would have wanted every drop of performance they could and they had a better production head but they tossed it on there suv?!?! It doesn't cost any more to produce the gt40 head. I'm a chevy guy that inherited my mom's 95 mustang gt convertible so these small ford details are new to me, it's not fast per se but with a 5 speed it buggs along decent enough to be fun to drive but calling the 5.0 an HO is amusing it is noticably faster than my 85 Z with the LG4 5.0 and a 700r4 I had years ago, I loved that car but it was sloooow
Sir Holdener, will there ever be any plans to do a comparison of the two best heads available, the TFS 11R vs an AFR Renegade on a stock bottom end 302????
The Kaase canted valve heads might be better and still fit a stock 4.0 bore. They're huge though, 240cc. Car craft did a test years ago with a huge hydraulic roller and made 520hp with a stock 5.0 short block at 7800rpm.
@@timothybayliss6680 those are a bit out of range of ‘most’ enthusiasts! I think the 11R and the AFR are easily the two biggest contenders for the average sbf guy looking to get a new set of heads wanting the most power they can get on a reasonable budget.
I think there's an unanswered question here. What do you get if you put a decent set of springs on the GT40p heads? You made note that your valve springs were a problem, and a set of springs is dirt cheap compared to even the Edelbrocks you used for your next stop up.
@@richardholdener1727 I see your point. If the port is already at max flow there's nothing to gain by having springs capable of supporting higher revs.
How about the cheaper Edelbrock heads and a XE274 cam?!? I’m thinking it would at least equal the power of the AFR165’s in this test! Cheaper heads and cam is probably the same cost as the XE264....cheaper combo, same power!
@@richardholdener1727 i am referring to the Edelbrock heads in your test....you said they were much cheaper than the AFR’s used in the test. The Edelbrock heads made less power than the AFR’s using the same XE264 cam. Would the Edelbrock heads, used in the video, run with XE274 cam make equivalent power to the AFR’s, used in the video, with the XE264 cam, used in the video?
GT40/GT40P heads won't bolt right onto a 351W in the junkyard.... the head bolts are the wrong size. DO **NOT** use a regular "twist" drill bit to make the bolt holes in the heads bigger!! ... you need a proper .500" or .501" machine reamer to do the job properly.
Actually some of them will. I have a early 96 Explorer that had F3ZE GT40 castings (not the hecho en Mexico ones) on it with 1/2" bolt holes and NOT drilled for smog. Only set I've seen like that but obviously they're out there...
I’m glad you did this. I have a 65 fastback mustang with a 327 SBF with red cornet ported gt40 heads and comp 25-246-3 cam. I love it. It was put together in 1998 and its a mix breed. I do not remember all the parts and have never had to rebuild it. I am hesitant to change heads but want more power. I have 190 cc edelbrock rpm heads and seeing this has made me decide to put them on. With the current engine I have beat in the 1/8 mile. late model 5.0 stangs challenger , charger and a 2016 corvette ( shouldn’t have won this one ) . I’m afraid to give up dependability.
Just put a gt40 headed 302 stock bottom end on the dyno. Made 360hp and 360ft lbs of torque with the xe266hr camshaft. Edlebrock 600cfm with the edelbrock performer 289 intKe manifold. Ran clean out to 6500 still making 330hp at that rpm. Very happy with this combo
@@shalver66 the best advise is what ever cam you think you want, buy the next step down. Get another XE camshaft but with a little less lift. On the other hand, pretty sure Richard has run the xe274hr with a stock bottom end. Watch all his sbf videos, good info. Between him a David vizzard i built a 306 that makes 480 hp with 445ft lbs of torque on pump gas, with world products iron heads
I am putting together a Ford v8 302 engine from the year 79 With flat head forged pistons with only two cavities per piston, gt40 f1ze covers with 49 mm multi-angle intake valve and 40 mm multi-angle exhaust, 289 intake manifold, 750 cfm edelbrock carburetor, multi-spark msd ignition, non-roller hydraulic tappets, with a 5-speed gearbox and 15 x what I would like, recommend the cam according to that, taking into account that it is put on a F1 model 51 street and quarter mile. What camshaft do you recommend?
Hi guys I'm building a 306 with fully ported gt40 heads ported lower explorer Anderson n41 cam trick flow valve springs 70mm tb and BBK 1 5/8 shortys what power numbers am I looking at
GT40/P for a street car that you want some pep in it I'd skip the eddie heads AFR heads would be my go to. Almost 400hp (roughy, an extra 70hp) for an additional $800-900. If I get the Eddie heads for $1100, how much more would I have to spend on the short block to make 400hp? A set of pistons is about $600 to raise the compression and even then, it may not be enough. So for a weekend warrior, AFR would be the best bet and they would still lend themselves nicely if I were to build a short block or go to a high comp, big bore 351w.
Dang it Richard, you're giving away the factory lightning set-up to the dumb dumbs! Another awesome video sir! My hot street set-up has always been the f4 351w, gt-p's, trick flow stage two. Such a rowdy trash can engine!
Got a set of home ported big valve e7's, a set of gt40 and gt40p's, and my Canfield 192cc's. All have homes save for the p heads. Got the Canfield's for $600 complete on CL. Rest came from cheap junkyard motors.
Love your videos! I picked up a junkyard high milage (200k)1996 explore 5.0 with GT40 heads. I took a chance and thru it directly into my 65 Fastback with AOD trans and lost the EFI and carbed it, put all the vbelt stuff on it and man I am happy. It gets on it when I smash that throttle. Probably have about $400 total into that engine swap (engine, gaskets, and conv harmonic balancer). My question is should I have ported my gt40 heads on exhaust side? Would there be noticeable more power and how much difference? Also now days I want to keep good MPG since I daily drive my car. Should I swap out the cam for like a TFS1 came and springs? Would that lose more MPG then the explorer cam? Currently intake is Performer 289 and exhaust mainifods are stock 65 289 ones and 3.55 rear end. Im not trying to make a track car, just a daily driver with great MPG and some wallumpf!
So there isnt a big power difference between the standard 40s and the Ps? Currently cleaning up the bowls on a set of GT40 heads now. Exhaust looks to need the most work lol. Went with a super low buck combo, whole explorer 5.0, BBK LTs, lunati valve spring upgrade, 1.7 RRs and an E cam. Going into a 90 Tbird SC to be a drift learner car.
Did you ever get valve float fixed to see what kind of games they would make what is the best spring so far for the gt40p heads to help fight valve float
Raced a 306 for 2 years. Had professional ported set of 65 289 on it. Bought a set of rpm heads on it! Picked up 1 tenth, that's it! The weight reduction was probably half that!! Went to a 351w with the ported heads! Picked up a whole second in the 1/8 mile! Paid $500 for the 351w short block! Solid lifter Fred Flintstone cam! If a 351w will fit!! The headers were really close to the floor boards, but didn't hit!
Gday. Mate ya videos are fantastic I went the lazy route a. Blueprint 306. They original stated 390 horse power and end up with 300 rwhp but I should have got the 347. Ohh well still tears the rear tyres up. Keep up the great. Videos. Blueprint. Heads. Seem to do ok. Also
Already I have the '95 351 Windsor with the full ported GT40P heads, to finnish my homework I want to install the Z303 roller cam, and further like Richard put it boost, hahahaha (evil laugh)
i built a 398w and put gt40 heads on it seems to run real good with plenty of power been wanting to put it on the Dino to see what it makes feels like 450 or 500 hp cant wait to see
GT40 heads are really attractive for the price, but a good cylinder head combo doesn't move my T-Bird while the engine is sitting on the dyno. The promise of removing 60lbs entirely by switching to aluminum heads is pretty appealing. Throw the battery in the trunk, and I'm getting closer to 50/50 weight distribution.
It should be mentioned the GT40p does have a smaller exhaust valve than the gt40 which once you get past .500 lift has a dramatic effect on flow. If you go with a gt40p you should probably stay around .500 or less unless you do some valve work to open them up. If you want a high lift cam you should probably get the GT40 instead.
My combo is 2000 explorer long block Alex springs drop in springs , B cam with 1.6-1.7 scorpion roller rockers. Mac long tube headers .Fox coupe V8 swap T5 , 4.10 gears .
@@void7365 runs plenty strong in a 2800 lb foxbody with a/c , not stripped down . I disagree with the whole blurb on the gt40 being better due to a bigger exhaust valve . P head is a fast burn head , I found no difference when I put 16* initial timing in my car , in fact car ran like crap low rpm with b cam . I put timing at 12* with spout out and car drives damn good now. I do drive this car to work 26 miles one way . For a stock head I like the p head , I would not put a huge cam with a stock head anyway so there’s a reason I bought aluminum heads for another project.
I’d like to see the GT40 head on a Windsor vs the Double Hump heads on the 350. I know that the double humps would have the advantage because of the fast burn combustion chamber design vs the GT40 semi hemispheric design with similar camshafts. Just another idea. Thanks again Richard for a great video.
I think the GT40'S would flow more air and that's where the power would come from. My 40P's are 58cc chambers. I can't tell you the specs on the Chevy heads.
I have the original E5 head off my motor. I had them plained down 8 thousandths to get a good surface. I came across the 40P's by accident. Through the research I did I knew they were a better head and added HP. The 40 series heads have weak springs. I decided to get the upgraded springs so I wouldn't have any valve float. I'm looking to get them ported. Not many shops do that now. I don't have any experience doing that so I'm leaving my hands off so I don't screw them up.
@@charlesespenshade Look up Eric Weingartner racing and Headbites on RUclips. A lot of porting and polishing tutorials. If you’re going to upgrade cylinder heads in the future, go with a set of AFR 185cc Renegade or the Enforcer cylinder heads. By the time you pay an experienced porter, Machine shop machining for screw n studs-guide plates, 2.02-1.60 valves, you could get a very nice set of aluminum heads that will smoke the GT40’s. All that work done on the GT40’s would be $1200.00 and up. Good luck on your project.
@@StainlessTIG2 I'm running stock rockers and push rods. I have $400 in my heads. The guy I bought them from had them shaved for a stroker motor he was building. He decided to go aluminum heads instead. For what I wanted to build the P heads are perfect. I'm not running down the strip with it. I just wanted a good street car. I got what I wanted to build all day long.
@@StainlessTIG2 All I had to do to the P heads is fix the weak spot being in the springs. If you think Frankenstein is slow, think again. I'm still in building stage you can say. I'm still running the 7.5 rear which won't hold up long. I have subframe connectors that need put in yet also. My motor has a lot of torque. Having the V6 torque converter, trans and rear displaces the power in a different way. It's named Frankenstein for a reason. Nothing in that car really belongs in it but it all works perfectly together.
Richard, I remember seeing a video a while back that had one engine run a comp 266 cam but I'm having a hard time finding that clip in one of these vids. Could you help me? Looking at doing the 35-514-8 and afr165s in my 96 explorer
Hay Richard. On tonights live feed. Can you discuss oil control hacks. Re routing , plugs, and so on. In the last feed i mentioned rhoads lifter or bleed off lifters. Could you do some oil pressure test to see if these can be manipulated with oil pressure?
EFI to carburetor? What's wrong with EFI? EFI is supposed to make more power whilst being more efficient than carburetors? (at least with 4 cylinder engines) O.O ...Anywayz - I find aluminium heads more appealing than cast iron heads as they have the potential to allow the engine(head)to run cooler, which should have other benefits... >.>
I've got a 97 mountaineer 2wd auto 5.0 could you recommend a good cam and springs it's got about 210 hp I'm lookin to get about 300 hp I'm planning on getting rid of the cats and doing a single 3 1/2" exhaust with a super 40 and stock manifolds also a cold air intake also do I need to do anything with fuel
Good timing Mr Holdener. I am doing a gt40p swap this week. Waiting for the heads to come back from the machine shop. I nicked some of the valve seats while porting the bowl and had to have the seats re ground. I am upgrading the valve springs with the TFS spring kit and topping it off with 7.1 ratio roller rockers. The engine was using D8OE heads so I am hoping to get 50HP out of this swap.
Hmm... These graphs show GT40 heads and a turbo is the way to go unless all you want is high rpm. Then buy high flow aluminum and build the whole engine to handle 7500rpm or higher. Me? I'm building a car to drive all over and tow a camper so I'm going with the GT40 and a turbo. My only choice rebuild my 302 or buy a junkyard 351. Although I'm leaning more towards keeping my 302, get the GT40 heads, put high quality valve springs in and rev that engine to 6500-7000. 450hp for cheap with a turbo 302 is sounding really good. Hopefully I can coax 400+ lb-ft out of it at 3000rpm. Big block power out of a tiny engine.
the gt40p heads were made starting in late 1997 so they were built for EFI. But I would go with GT40 heads instead if you intend to go with a cam with .500 lift or more because the GT40p has a smaller exhaust valve.
I would like to see a 351w with max ported gt40heads, milled down, bigger valves, roller rocker conversion, good race valves, polished chambers, It would be nice to see what the combo would do if you were to do everything possible to the gt40 heads. I have looked all over the internet and no one has done a video on a truly maxed out set of gt40 heads its really disappointing!
True I've looked for the same thing yet I know many guys did the exact thing to these heads 30 years ago
@@timothywalker2273 problem is... as good as the internet is, you can't beat paperback..... I have kept over 30 years of street machine, zoom, fast ford, performance ford etc etc, and I can tell you that finding the 30 year old articles detailing the work involved from the guy's whom did this. Is worth it's weight in gold 👍
What it costs for a fully worked 240 cfm GT40 head you can buy aluminum. Many hours labor and flow benching. Vizard iron GT40/ E7TE heads are $4,000 ready to run.
I think Charlie Servideo said $2,000 for just porting his.
@@hotrodray6802 I understand there's better cheaper ways these days but the look on someone's face when they underestimate you and you blow their doors off is priceless
@@sheldonbromen2603 Then definitely get DV iron heads and Big Dogs stage 3 original HO intake and ported 65mm and BD cam.
Or even BD ported iron heads for less $. Look stock, make 400+ HP crank, and 340+ wheel.
ford stuff? instant thumbs up from me.
I'm real impressed by my stock 94 mustang short block with milled (.040) gt40 heads, Alex springs, comp nx264hr cam (adv 4deg), Mac equal length headers, ported explorer lower stock explorer upper and tb. Streetability is very responsive and fun. Plus still 20mpgs.
good combo
I'm running a Crane 284-2 cam. What a wild ride with the 4r70w trans and 273 gears.
@@charlesespenshade you got any videos of your set up?
Yes.
ruclips.net/video/ihN-15Kn1BM/видео.htmlfeature=shared
@@gntsmetalfab8094
ruclips.net/video/ihN-15Kn1BM/видео.htmlfeature=shared
I scored some NOS Two-Bar (Marine) GT40 heads. A friend ported them, removed the EGR bumps, cleaned up the slag on the OE headers (40% larger at flange!) added a ported E4 intake, a recurved distributor, and 1.7 SVO rockers to my '85. Woke it RIGHT up and nobody knows it's modded. :-)
Well now you have to do a GT40 head on the 351 test Richard.
Makes a LOT of low-end Torque, especially with a stock HO Mustang cam, if you have a 1994-up 5.8L roller block.... but runs out of airflow pretty quick as the RPM's climb. Great towing/torque engine, though.
I just got done doing this. Gt40p's from a 2001 Mountaineer. $39 each at my local yard. Ported them myself and had a friend mill them. Added an Alex's drop in spring kit and they work great! Awesome performance on a budget.
I’m in the process of doing the same! Did you use your stock rocker arms?
How much you can mill the head? Stock cam? Stock rocker arm ? I want to improve my explorer motor but i dont know how long i can go without stamping a valve in a pistón 🤣
@@humbertogarza9225 Check P/V now, then mill once you know what you have. As in, if you have.200" and you can live with .08" then mill .120" off.
Do you have the link for those springs?
What about headers, don’t need different headers to run GT40p in a fox body?
Every time I build a sbf I use gt40 or gt40p heads from explorers. 351w late. Model blocks with roller cam and gt40p heads work good for truck
You should redo this kind of test put upgrade the springs from the GT40/P heads. The engine is only designed to go to 5,000 rpm and you ended up with valve float
No specific peak HP/TQ numbers for the Edelbrock or AFR-CNC heads ?
30 hp for real cheap. Like it. 🤘😎🇺🇸
Dang, i was really hoping to se what the gt40p heads do on a 351
This
@@hondatech5000 no, that's too much of an assumption.
take a look at the tfs TW head test video
@@richardholdener1727 ok, thanks. I'll go through them all and find that one. Unless its labeled tfs tw head test video.
@@richardholdener1727 is that the video with the 347?
Running a 302 explorer swap from a running mountaineer I snagged for 400$ set up with a holley sniper is actually a pretty rowdy set up for my Miata swap. Haven’t done any dragy times but its all power to weight at this point for me
Aluminum heads are defenitely worth the investment, specialy in the long run.
302 parts = 302 power.
☕.. thats a cheap 30 real hp!
The People’s head for me. For a budget street engine, it’s seems to make power in all the right places.
I would like to see c9ve or D0ve heads on a built 460 vs trick flows or edelbrocks someday please 🙏
That's a lot of money. Hopefully someone loans him a set of those old 70's heads.
@@ruszko726 I have a set of d0ve heads he could use.
I have C8VE and C9VE heads I could loan
Thank you for all of your help and testing Richard. I just purchased a 351 from a guy last week. I’m looking for a set of gt40 heads now. The yard is out of them. I will let you know what I think of the set up when I get it in my foxbody vert next year.
Tengo un v8 sn 1994 le puse de exolorer 1998 ahora q puedo hacer ya que el cuerpo de aceleración lo quiero más grande y que salga como el fox body
Translation. Get cheap GT40 (P) heads and spend the money on Boost instead of aftermarket heads.
Alloy head with big valves and stock pistons is a pain. You will have to message valve pockets.
Should make a video of the vortec head sbc with the 268 cam vs the gt40 sbf with the same cam.
Both 40 and 40p heads will need better valve springs for high rpm work but the biggest difference is the relocated spark plug and smaller exhaust valves on the 40p. Ford moved the plug for better fuel mixing and went with the smaller E7 size valves because the hardened seat inserts on the earlier GT40's were more expensive than induction hardening the seats on the p's. Ford made up for the smaller valves with a slightly better exhaust port on the latter heads. Both will support 375-400 hp with mild porting (mostly on the exhaust side) and the right cam but i think they more cost effective and durable for a 350 ish HP 302 400 HP 351 build.
Would you mind trying truck-oriented combinations for the 5.0/5.8? On this power/torque graph, none of the rpms plotted are relevant for a truck for towing, pulling its own heavy weight and offroading, where a truck needs a lot of torque in the lower rpms. Maybe 1000 to 4000 rpm gains? Stock intake versus Edelbrock? Stock heads versus GT40(p), AFR 165? Sorry if I'm asking for a lot. OBS Ford Bronco here.
GT40/GT40P heads on a 5.8L/351W (1996 in my F250) with a stock '88-'92 Mustang HO cam and longtube Hedman Hedders makes HELLA towing power with 4.10 gears! People will think you have a 460 under the hood! However... the stock 351W/5.8 EFI intake stops at around 4000-4500 rpm TOPS! (dual 3" Y-into a single 3" exhaust)
A 408W stroker engine with GT40/GT40P heads (watch your compression ratio!) and a stock HO Mustang cam will make torque almost comparable to a 460. The stock EFI 5.8 intake will be 100% done by 4000 RPM, though.
@@linctexpilot8337 Go carbureted
When you pick up the GT's make sure to snag an Explorer upper intake, it's actually a little big for your application but everything else is even bigger.
@@johnjones928 I thought the explorer upper intakes weren’t as good as the older 5.0 intakes from bronco’s and such for flow? I know the Frank-intake idea where you use a 351 lower with 302 truck upper ported and matched is the best oem thing you can do but I didn’t think the explorer intake was better?
Answering your question, depends on what you want or are using the motor for. If it’s just a Saturday cruiser and you’re on a budget, the GT40(p) heads are perfect. If you want more HP and invested in other mods to support added HP, then a good set of aluminum heads makes sense.
Why is the 93 cobra and Lightning rated at 235-240 hp with non P heads??? Dont reg old Gt40 heads flow better than gt40P??
GT40 P heads make the same power
I concur with gt40 over gt40p.
I have a 1989 crown Vic ltd with a 302 with 83k miles my motor idles high I’m guessing it needs a tune up for sitting so long it hesitates in gear Sometimes I’m trying to refurbish throw motor on stock block just rebuild all over it any advices or tips? I have videos up of me working on it slowly
SOUNDS LIKE VACUUM LEAK
Other than practical reasons like heavier vehical needs more power why the hell would ford put the crappier version of there 5.0 head on there flagship performance car?? You would think in the even then pony car wars ford would have wanted every drop of performance they could and they had a better production head but they tossed it on there suv?!?! It doesn't cost any more to produce the gt40 head. I'm a chevy guy that inherited my mom's 95 mustang gt convertible so these small ford details are new to me, it's not fast per se but with a 5 speed it buggs along decent enough to be fun to drive but calling the 5.0 an HO is amusing it is noticably faster than my 85 Z with the LG4 5.0 and a 700r4 I had years ago, I loved that car but it was sloooow
the gt40 head was introduced long after the 5.0l Mustang came out
at what compression? this tests? and at would different 13.5 compression test on race gas 112 oct. , 114 octane. 500 h.p. +???
9.5:1
Sir Holdener, will there ever be any plans to do a comparison of the two best heads available, the TFS 11R vs an AFR Renegade on a stock bottom end 302????
love this idea!
The Kaase canted valve heads might be better and still fit a stock 4.0 bore. They're huge though, 240cc. Car craft did a test years ago with a huge hydraulic roller and made 520hp with a stock 5.0 short block at 7800rpm.
@@timothybayliss6680 those are a bit out of range of ‘most’ enthusiasts! I think the 11R and the AFR are easily the two biggest contenders for the average sbf guy looking to get a new set of heads wanting the most power they can get on a reasonable budget.
Tim-Must not have been on a stock short block-there is not enough P-V on a stock short block to make anywhere near 520 hp
11r vs Enforcer is not really a good comparison-better as cast vs as cast or cnc vs cnc
I was just wondering if my 1960s 302 block would be able too work with the gt40p heads
yes
I think there's an unanswered question here. What do you get if you put a decent set of springs on the GT40p heads? You made note that your valve springs were a problem, and a set of springs is dirt cheap compared to even the Edelbrocks you used for your next stop up.
more rpm potential for GT40P, but not the power gains offered by the Edel or AFR
@@richardholdener1727 I see your point. If the port is already at max flow there's nothing to gain by having springs capable of supporting higher revs.
How about the cheaper Edelbrock heads and a XE274 cam?!? I’m thinking it would at least equal the power of the AFR165’s in this test! Cheaper heads and cam is probably the same cost as the XE264....cheaper combo, same power!
what Edel heads would make as much as AFR 165s?
@@richardholdener1727 i am referring to the Edelbrock heads in your test....you said they were much cheaper than the AFR’s used in the test. The Edelbrock heads made less power than the AFR’s using the same XE264 cam. Would the Edelbrock heads, used in the video, run with XE274 cam make equivalent power to the AFR’s, used in the video, with the XE264 cam, used in the video?
GT40/GT40P heads won't bolt right onto a 351W in the junkyard.... the head bolts are the wrong size. DO **NOT** use a regular "twist" drill bit to make the bolt holes in the heads bigger!! ... you need a proper .500" or .501" machine reamer to do the job properly.
Actually some of them will. I have a early 96 Explorer that had F3ZE GT40 castings (not the hecho en Mexico ones) on it with 1/2" bolt holes and NOT drilled for smog. Only set I've seen like that but obviously they're out there...
I got a set of Ps a guy was using on his truck. Had the 1/2 inch holes. Don't know where he got them. Lightning?
Yamaha V6 or V8 from an old Taurus SHO with some boost would be cool. Maybe even the 24 valve Duratec V6 if SHO engines are non-existent in the yard.
I still want to see the Volvo 4.4l version of the 60° v8. They're rated at 300hp and would be almost free in a junkyard. Lots of kung-fu noises.
So the gt40p heads will give you 30 horsepower? And more torque on your daily driver.
yes
I’m glad you did this. I have a 65 fastback mustang with a 327 SBF with red cornet ported gt40 heads and comp 25-246-3 cam. I love it. It was put together in 1998 and its a mix breed. I do not remember all the parts and have never had to rebuild it. I am hesitant to change heads but want more power. I have 190 cc edelbrock rpm heads and seeing this has made me decide to put them on. With the current engine I have beat in the 1/8 mile. late model 5.0 stangs challenger , charger and a 2016 corvette ( shouldn’t have won this one ) . I’m afraid to give up dependability.
Stock GT40(P) heads? No spring upgrade? YEP!
😀
OBVIOUSLY NEEDS SPRINGS FOR THE CAM USED IN THE TEST-STOCK WAS NO PORTING
Just put a gt40 headed 302 stock bottom end on the dyno. Made 360hp and 360ft lbs of torque with the xe266hr camshaft. Edlebrock 600cfm with the edelbrock performer 289 intKe manifold. Ran clean out to 6500 still making 330hp at that rpm. Very happy with this combo
I was going to try the same with XE274HR.
@@shalver66 if you dyno it, please share your results
@@jasonhooey5677 I’m working on it now. I’m concerned about the PTV clearance. We’ll see when I get to that point.
@@shalver66 the best advise is what ever cam you think you want, buy the next step down. Get another XE camshaft but with a little less lift.
On the other hand, pretty sure Richard has run the xe274hr with a stock bottom end. Watch all his sbf videos, good info.
Between him a David vizzard i built a 306 that makes 480 hp with 445ft lbs of torque on pump gas, with world products iron heads
I got a 1989 crown Vic build
When do we get to see a 351w with gt40 heads and a turbo
Or a roots blower im going to do 351w worked over gt40s and a 174 or 671 blower
I have a 302 (327) with a 174 blower video and head swap video already up
@@richardholdener1727 yeah but 351 Windsor with GT40 heads 👀
LOVE
I know I have been busting your chops a lot about doing this video lol THANK YOU for doing it!!!! THIS is why you are awesome.....LITERALLY lol
I am putting together a Ford v8 302 engine from the year 79 With flat head forged pistons with only two cavities per piston, gt40 f1ze covers with 49 mm multi-angle intake valve and 40 mm multi-angle exhaust, 289 intake manifold, 750 cfm edelbrock carburetor, multi-spark msd ignition, non-roller hydraulic tappets, with a 5-speed gearbox and 15 x what I would like, recommend the cam according to that, taking into account that it is put on a F1 model 51 street and quarter mile. What camshaft do you recommend?
I DON'T KNOW WHAT P-V CLEARANCE THAT COMBO HAS-YOU NEED TO MEASURE IT
@@richardholdener1727 Sorry, i don't understand what you mean by p-v
Hi guys I'm building a 306 with fully ported gt40 heads ported lower explorer Anderson n41 cam trick flow valve springs 70mm tb and BBK 1 5/8 shortys what power numbers am I looking at
have not tested that-not sure how well your heads are ported
@Richard Holdener head runners were gasket matched 3 angle valve job and valves pocket ported
I have GT40 explorer heads
(not p) and explorer intake with throttle body, everything else is stock. Major difference in power 😮
GT40/P for a street car that you want some pep in it
I'd skip the eddie heads
AFR heads would be my go to. Almost 400hp (roughy, an extra 70hp) for an additional $800-900. If I get the Eddie heads for $1100, how much more would I have to spend on the short block to make 400hp? A set of pistons is about $600 to raise the compression and even then, it may not be enough.
So for a weekend warrior, AFR would be the best bet and they would still lend themselves nicely if I were to build a short block or go to a high comp, big bore 351w.
I always tell people if you want to make quality, streetable horsepower, invest energy and just a few bucks in getting the right heads.
Just purchased an original low mileage 1986 Mustang. What do I need to do in order to get into some of these performance Foxbody/sbf upgrades?
heads, cam, intake
@@richardholdener1727 Do I have to change pistons on a 1986?
What kind of long tube headers for the gt40p? Any budget
1 5/8 or 1 3/4 work
Dang it Richard, you're giving away the factory lightning set-up to the dumb dumbs! Another awesome video sir! My hot street set-up has always been the f4 351w, gt-p's, trick flow stage two. Such a rowdy trash can engine!
Trick Flow Stage 1 cam will match the flow of those GT40P heads better than Stage 2.
Got a set of home ported big valve e7's, a set of gt40 and gt40p's, and my Canfield 192cc's. All have homes save for the p heads. Got the Canfield's for $600 complete on CL. Rest came from cheap junkyard motors.
So how much better are they the old late 60 early 70 302 heads
early heads are not any better
Love your videos! I picked up a junkyard high milage (200k)1996 explore 5.0 with GT40 heads. I took a chance and thru it directly into my 65 Fastback with AOD trans and lost the EFI and carbed it, put all the vbelt stuff on it and man I am happy. It gets on it when I smash that throttle. Probably have about $400 total into that engine swap (engine, gaskets, and conv harmonic balancer). My question is should I have ported my gt40 heads on exhaust side? Would there be noticeable more power and how much difference? Also now days I want to keep good MPG since I daily drive my car. Should I swap out the cam for like a TFS1 came and springs? Would that lose more MPG then the explorer cam? Currently intake is Performer 289 and exhaust mainifods are stock 65 289 ones and 3.55 rear end. Im not trying to make a track car, just a daily driver with great MPG and some wallumpf!
a mild cam will help and won't hurt cruise mileage much if any
Great stuff again! By far my most favorite channel. Thx Richard!!!
So there isnt a big power difference between the standard 40s and the Ps? Currently cleaning up the bowls on a set of GT40 heads now. Exhaust looks to need the most work lol.
Went with a super low buck combo, whole explorer 5.0, BBK LTs, lunati valve spring upgrade, 1.7 RRs and an E cam. Going into a 90 Tbird SC to be a drift learner car.
Good stuff good video! But what about compression? Gt40 has bigger chamber then gt40p or stock head has
Did you ever get valve float fixed to see what kind of games they would make what is the best spring so far for the gt40p heads to help fight valve float
I run comp 977 springs with crane roller rockers. No issues around 450-500whp with an ON3 turbo kit, launch control etc
Raced a 306 for 2 years. Had professional ported set of 65 289 on it. Bought a set of rpm heads on it! Picked up 1 tenth, that's it! The weight reduction was probably half that!! Went to a 351w with the ported heads! Picked up a whole second in the 1/8 mile! Paid $500 for the 351w short block! Solid lifter Fred Flintstone cam! If a 351w will fit!! The headers were really close to the floor boards, but didn't hit!
do you need wider TB or intake for this head with the explorer upper/lower intake?
a better than stock HO one helps
how about 89 302 ctown vic up grades
responds the same as any 302
Do some 351w have GT40 heads? If so which ones?
only Lightnings
Thanks for doing these. Building up an 89 5.0 HO to put in a 79 Zephyr. What mods can be done to help below 5000rpm ?
dual plane, small cam, compression, good heads
@@richardholdener1727 Thanks.
Gday. Mate ya videos are fantastic I went the lazy route a. Blueprint 306. They original stated 390 horse power and end up with 300 rwhp but I should have got the 347. Ohh well still tears the rear tyres up. Keep up the great. Videos. Blueprint. Heads. Seem to do ok. Also
For a 5k rpm and down engine, that is a good power curve
Already I have the '95 351 Windsor with the full ported GT40P heads, to finnish my homework I want to install the Z303 roller cam, and further like Richard put it boost, hahahaha (evil laugh)
Will these work on a 69 302 Mustang?
yes
i built a 398w and put gt40 heads on it seems to run real good with plenty of power been wanting to put it on the Dino to see what it makes feels like 450 or 500 hp cant wait to see
let me know what it makes
@@richardholdener1727 plan on taking it to ford fest they will have a dino down there it's in the car a 71 Torino
Is that just carbuerator that is falling off at higher rpm on the good heads? Need a 750 or 850?
My plan is both power increase and weight loss, aluminum it is unless you've got something better
GT40 heads are really attractive for the price, but a good cylinder head combo doesn't move my T-Bird while the engine is sitting on the dyno. The promise of removing 60lbs entirely by switching to aluminum heads is pretty appealing. Throw the battery in the trunk, and I'm getting closer to 50/50 weight distribution.
Pertronix Pertronix 8561Ht-1 Black Ceramic plug boots fixed my header issues !
It should be mentioned the GT40p does have a smaller exhaust valve than the gt40 which once you get past .500 lift has a dramatic effect on flow. If you go with a gt40p you should probably stay around .500 or less unless you do some valve work to open them up. If you want a high lift cam you should probably get the GT40 instead.
Good point
My combo is 2000 explorer long block Alex springs drop in springs , B cam with 1.6-1.7 scorpion roller rockers. Mac long tube headers .Fox coupe V8 swap T5 , 4.10 gears .
@@allenjay8157 Hows it run?
@@void7365 runs plenty strong in a 2800 lb foxbody with a/c , not stripped down .
I disagree with the whole blurb on the gt40 being better due to a bigger exhaust valve . P head is a fast burn head , I found no difference when I put 16* initial timing in my car , in fact car ran like crap low rpm with b cam . I put timing at 12* with spout out and car drives damn good now. I do drive this car to work 26 miles one way .
For a stock head I like the p head , I would not put a huge cam with a stock head anyway so there’s a reason I bought aluminum heads for another project.
Richard, What do you think about adapt a Nissan vk56 32 valve in to a 302 por 351W? IT's have very similar bore spacing.
how similar?
@@richardholdener1727 112mm (4.409" on vk56) vs 111.252mm (4.38" Ford 302/351W).
There is a guy that adapt a LS head on a Ford 351W and work.
I’d like to see the GT40 head on a Windsor vs the Double Hump heads on the 350. I know that the double humps would have the advantage because of the fast burn combustion chamber design vs the GT40 semi hemispheric design with similar camshafts. Just another idea. Thanks again Richard for a great video.
I think the GT40'S would flow more air and that's where the power would come from. My 40P's are 58cc chambers. I can't tell you the specs on the Chevy heads.
I have the original E5 head off my motor. I had them plained down 8 thousandths to get a good surface. I came across the 40P's by accident. Through the research I did I knew they were a better head and added HP. The 40 series heads have weak springs. I decided to get the upgraded springs so I wouldn't have any valve float.
I'm looking to get them ported. Not many shops do that now. I don't have any experience doing that so I'm leaving my hands off so I don't screw them up.
@@charlesespenshade Look up Eric Weingartner racing and Headbites on RUclips. A lot of porting and polishing tutorials. If you’re going to upgrade cylinder heads in the future, go with a set of AFR 185cc Renegade or the Enforcer cylinder heads. By the time you pay an experienced porter, Machine shop machining for screw n studs-guide plates, 2.02-1.60 valves, you could get a very nice set of aluminum heads that will smoke the GT40’s. All that work done on the GT40’s would be $1200.00 and up. Good luck on your project.
@@StainlessTIG2 I'm running stock rockers and push rods. I have $400 in my heads. The guy I bought them from had them shaved for a stroker motor he was building. He decided to go aluminum heads instead. For what I wanted to build the P heads are perfect. I'm not running down the strip with it. I just wanted a good street car. I got what I wanted to build all day long.
@@StainlessTIG2 All I had to do to the P heads is fix the weak spot being in the springs.
If you think Frankenstein is slow, think again. I'm still in building stage you can say. I'm still running the 7.5 rear which won't hold up long. I have subframe connectors that need put in yet also.
My motor has a lot of torque. Having the V6 torque converter, trans and rear displaces the power in a different way.
It's named Frankenstein for a reason. Nothing in that car really belongs in it but it all works perfectly together.
Richard, I remember seeing a video a while back that had one engine run a comp 266 cam but I'm having a hard time finding that clip in one of these vids. Could you help me? Looking at doing the 35-514-8 and afr165s in my 96 explorer
I run a set that I massaged on a 331 with AMF N41 cam. Runs like a scalded dog
Hay Richard. On tonights live feed. Can you discuss oil control hacks. Re routing , plugs, and so on. In the last feed i mentioned rhoads lifter or bleed off lifters. Could you do some oil pressure test to see if these can be manipulated with oil pressure?
I picked up a complete 96' explorer (GT40) engine and AOD-E for $200 a few weeks ago! Idk what I'm doing it yet haha
stock cam efi
Came here to find exactly this info, lines up with my research and bench racing. Thanks!
I have similar cam specs. But i have GT40 style intake and #24 injectors. Long tube headers too. Hoping for close to 275- 300 hp at crank. 🤞
Will the GT40 heads bolt to the 351w?
yes-might need bigger head bolt holes-some are 7/16th
Seen your video about the turbocharged Buick 455. Really need help with what kind of setup and products you used.
How much cam would be to much cam for the gt40s
that depends more on available p-v
Should do a head test with a 351w
Personally I blame squirrels
crown vic
EFI to carburetor? What's wrong with EFI? EFI is supposed to make more power whilst being more efficient than carburetors? (at least with 4 cylinder engines) O.O ...Anywayz - I find aluminium heads more appealing than cast iron heads as they have the potential to allow the engine(head)to run cooler, which should have other benefits... >.>
the head upgrade applies the same to efi 302s as well
I've got a 97 mountaineer 2wd auto 5.0 could you recommend a good cam and springs it's got about 210 hp I'm lookin to get about 300 hp I'm planning on getting rid of the cats and doing a single 3 1/2" exhaust with a super 40 and stock manifolds also a cold air intake also do I need to do anything with fuel
YOU WILL NEED MORE THAN A CAM BUT LOOK AT THE FORD E303
My 93 bronco 5.0 weak as water 180 hp
My 89 f150 5.8 with the same heads and intake 225 hp damn it's strong
Buy a 5.8
Torque makes a huge difference
In the process of adding ported gt40 heads, tfs1 cam and explorer intake
What are you using for push rods and rockers
@@sweetassugar2076 hardened stock length pushrods and the factory rockers for now
I just got a TFS stage 1 for my 351 and GT 40 heads going in my lowered 85 F 150 step side
Good timing Mr Holdener. I am doing a gt40p swap this week. Waiting for the heads to come back from the machine shop. I nicked some of the valve seats while porting the bowl and had to have the seats re ground. I am upgrading the valve springs with the TFS spring kit and topping it off with 7.1 ratio roller rockers. The engine was using D8OE heads so I am hoping to get 50HP out of this swap.
Thanks Richard! We appreciate what you do!
TRY THIS AND PUT CLEVELAND 2 V HEADS
These 5.0 videos are hard to watch, at this rate i may just put my 5.3/th400 combo into my f150 vs try to get 500hp out of the old 5.0 near. a budget
5.3l works too
What about a set of '65, 289 heads?
they flow like a E7TE head
Come on
What headers do you run to clear the spark plugs on the GT40p heads? I have a 302 I am building for a 1968 f100.
I’m running 60s mustang Tri-Ys
I have a rebuilt set for sale if you need some! Intakes also.
Hmm... These graphs show GT40 heads and a turbo is the way to go unless all you want is high rpm. Then buy high flow aluminum and build the whole engine to handle 7500rpm or higher.
Me? I'm building a car to drive all over and tow a camper so I'm going with the GT40 and a turbo. My only choice rebuild my 302 or buy a junkyard 351. Although I'm leaning more towards keeping my 302, get the GT40 heads, put high quality valve springs in and rev that engine to 6500-7000. 450hp for cheap with a turbo 302 is sounding really good. Hopefully I can coax 400+ lb-ft out of it at 3000rpm. Big block power out of a tiny engine.
Will this work with efi? I'm an off rd truck guy. So efi is a Must an everything I see is carb built
the gt40p heads were made starting in late 1997 so they were built for EFI. But I would go with GT40 heads instead if you intend to go with a cam with .500 lift or more because the GT40p has a smaller exhaust valve.