Building a 1970 BOSS 302 Engine! (Clevor)
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- Опубликовано: 19 окт 2022
- Building a 1970 boss 302 mustang engine but with a roller xxx block. Used OEM intake, pistons, rods, and valve covers. The heads are from a 1970 351 Cleveland engine. Block and crank are just regular from 86-95 era.
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Awesome print of the GT Mustangs in the woods!!
I had several real bosses. I have never seen that intake before. Usually it would say c9ze yours must be a ford substitute but yours works just fine. I built several of the bogus bosses and have 2 in my garage. If I remember right the pushrods were .800 longer for the difference in 351c heads from a std 302. Also boss had solid lifters. I am so glad you are building this.
Thanks! The intake is a warranty intake
The intake that is being used has a D1ZE-EA Ford part number so it probably is one that they sold as a replacement for the original. It looks good and should work just fine 🏁.
4V heads are made for the higher HP range at a higher rpm range and also a larger torque range. I'm from Australia. But did anyone think of using ceremic pots/pistons?oh 2v are great for lower HP rpm and torque
When doing plasti gauge on mains, I thought all bearings were supposed to be dry..
They are supposed to be clean and dry without any oil or residue.
Put a set of 2 barrel heads on it. It will make more power than you can stand. Good luck.
Absolutely love it man, great content I’d love to see more 👏
Interesting build. I always wanted to upgrade a Boss with ported heads and modern parts to see what power could be had while appearing stock on the outside.
I just refreshed one of my Cleveland’s that I raced on the streets back in the 2000’s. God I destroyed the SBC and BBC Chevy boys with their high dollar engines. I was running a 81 Capri 351-C with factory closed chamber 70 Boss 302 heads, Chris Parker funnel web intake with the tongues, roller camshaft, factory crankshaft, flat top forged pistons. Nothing special at all. I’m looking for 8.70’s with this combination on a 175 shot in my 86 mustang that is such a nicer car. I’m running all Tin Soldier front and rear suspension. Viking coilovers. I can remember getting kicked out of a race in KC Missouri because they said I was too fast for my cars roll cage in that 81 Capri. I qualified number 1 and the Chevy guys swarmed my car and next thing I’m disqualified. I’ve seen this happen so many times too us Ford guys, especially running Cleveland power.
Very nice BOSS clone. What's special is that you used big port 4V heads. Most clones use small port 2V heads, used to call them a "bogus boss"? Would like to see part 2 of this build.
It will be coming! I got very frustrated ordering push rods bc I measured wrong twice 🤦♂️
im an aussie born rev head and just my 2 cents but those 4v heads are only good for larger cube engines should have gone with a good set of 2v cleveland closed chambers
Then it wouldn't be a boss clone without the large port heads
I agree 100%. It's not a Boss in any way with the Windsor block and crank so why not go with the more driveable small port heads. If you know where I can get a good set of Aussie small port Cleveland heads please let me know as I'm in the market!
I don’t see any problem with using those 1970 Cleveland 4-V quench chamber heads for the purpose of building a Boss 302 clone. However, the original Boss engines were equipped with solid lifters and an adjustable valve train. It’s too late now but you should have had the Cleveland heads machined for 7/16” ARP screw-in rocker studs and pushrod guide plates. Then the valve train would be adjustable like original Boss 302 heads. Then using a solid lifter or a solid roller lifter with a compatible camshaft would be possible.
The big ports and valves in the 4-V head were designed to make huge amounts of horsepower at high rpm’s. Without modifying those heads for an adjustable valve train, you’re going to be limited to using a hydraulic cam and lifters along with lousy stamped steel rocker arms instead of adjustable roller rocker arms. Hydraulic valve trains can’t support the rpm’s needed to make any decent power.
Any good automotive machine shop that does performance head work could do it. They pull out the old rocker studs, mill .300” off the top of the rocker pedestals, then drill and tap the pedestals for the new screw in studs.
It’s that simple 🏁.
"Original Boss 302 manifolds" are just 1970 4v cleveland manifolds. They came installed only on M-code clevelands as the Boss 351, cobrajet 351, and HO didn't exist yet. Also, 1971 introduced a redesign for the driver side manifold to clear the redesigned steering box and will not fit in a 70 and vice versa.
Incorrect. They have an indent in front for oil filter.
Wish I had a few BOSS 302 4 bolt main blocks. Love the old Boss Mustang's
Those TRW pistons you are using do not have the reinforced skirts, they are notorious for cracking and breaking off. I know because I have owned my matching number 1970 Boss 302 since 1975, and the original pistons have broken skirts. When you start getting piston slap, you'll know why!
Thanks for heads up! I’m learning
There's a way to modify those pistons so they don't crack.
All of the L2324F and L2325F TRW pistons were modified to eliminate that problem. You can see the ribs on the inside of them, if you want to visually be sure. The TRWs are tough, reliable pistons, but quite heavy, and have nothing fancy like gas porting, modern thin ring grooves, etcetera. I'd skip them and use something like JE's SRP Boss 302 pistons (#289555), which are very nice pieces. Just an opinion about an option.
THAT describes ALL early 302s,, most have piston skirts in the pan,, and all the others are cracked. Have done lots of them. 351s are no better. Late 80s and 90s blocks have more support for the pistons and have decent pistons and they never break. At least in standard type use.
This channel needs more subs and views. You’ll get there!
I hope so! Than I could work on my stuff more often. Shops been busy
These are cool, but it's an expensive venture to make it look the part. For anyone who wants to do this a easier way, Edelbrock sells heads that are pre modified and a intake manifold as well.
Love what your doing. However seeing the little end of the rod discolored like that, No way, I'd use them rods.
They weren’t like that before. The machine shop put the pistons on them and that’s how they came back
Cool Build!
It’s different that’s for sure! I got a lot of crap from local ppl about it. “You can make such a better performing engine cheaper” kind of guys but I wanna feel how a real boss felt
@@zweifelgarage1817 well I think its cool as I am building one with 2v heads and a B&A street boss intake. putting it in my 1979 Mustang pace car.
There will always be haters no matter what you do!
I agree man! No one can ever just say “badass build” they always have to just tell you how they would do it lol
@@4mecz Nice! Hey I'm doing one as well, a real 70 boss 302 engine in my 89 fox coupe. What's your plans for headers? Do you have a set already. I really don't want to have to do custom.
@@zweifelgarage1817 Glad you're going for it. They'll say that stuff about how you can get the same for less with an inline-valve build, but it just ain't so, and maybe you like to be separate from the herd sometimes, anyway.
You are never going to get a small Ford with production inline-valve iron heads to run like one with production canted-valve/Cleveland/Boss 302 iron heads will, in my experience. Then they'll say, "Yeah, but you can get aftermarket inline-valve aluminum heads that flow as well as canted-valve heads for a good price." Sure. They "flow as good" may sometimes be true, but it won't be true for the heads most gearheads would consider reasonably priced. And those inline-valve heads are not semi-hemi heads with the advantages that provides. Plus there are some badass aftermarket aluminum (and iron) canted-valve small Ford heads available, too. Some even competitive in price with the inline-valve stuff.
Bottom line(s) for me?
Has there ever been an inline-valve small Ford engine that won the Engine Masters top prize? Highest I ever heard of one getting was a third place. Every time a really good builder built a canted-valve Ford for that contest every time I saw, that was the top prize winner. Think Jon Kaase, Scott Main, Tony Bischoff, SAM, etcetera.
Has any inline-valve small Ford ever won a Trans Am championship after 1967? Nope. Lots of Boss 302 based T/A championship winners, though.
Does the canted-valve small Ford have a sound all it's own, that perks up the ears of hardcore gearheads? I believe so.
Does the small Ford with what look like big engine heads on it look like no other small Ford? Are nearly 100% of chevy fans going to try to tell you that your 8.2 deck height Boss or Clevor is a "big block"? That your 9.206 deck height Cleveland is a "big block"? You bet they are. I like confusing chevy people. Call me a trouble-maker, I'll own it.
The Cleveland is IMO one of the cleanest looking, prettiest OHV engines ever made in the USA, besides. Okay, that's too subjective. I still claim it, anyway.
I see it's not a boss block. Was swapping the water jackets over expensive?
The real Boss 302 had the same water passages as an inline valve 302, and had "wet" intake manifolds like the inline valve 302. If you mean is it hard to reconfigure the water passages for using Cleveland instead of Boss 302 heads on a 302 block, read on.
Two ways I know of you can make the coolant flow happy.
CHI (and others) offer kits that have you drill into the the front end of the heads and thread in pipe fittings, then hook them via hoses into the separate or remote thermostat housing they provide. The advantage there is that you can keep your intake manifold "dry", like on Clevelands. Then I believe you drill the 11/16 holes in the block to match the passages in the Cleveland head and gasket, just like the Ford OHO Boss 302 guide said back in 1970. The kit I saw had pretty thorough instructions and templates.
I have always done it the "other" way. Either drill out (or have a machine shop do it for you) the Cleveland block to head passages in your heads for 1 1/8 freeze plugs, or drill and tap them for 3/4 pipe plugs, making sure you tap far enough so the plugs are even or very slightly below the surface of the heads. The extra step this requires is matching the heads and maybe the intake manifold end water passages. I use the Boss 302 intake gasket for a template when I do this. May have to do drilling and grinding, depending with what parts you're starting with. All of the intakes I have used on Clevor builds have had at least the front intake to head water port, so on some, I end up drilling the corresponding hole in the heads' intake face, and grind it to match the intake, or use the Boss 302 intake gasket as a guide as mentioned before.
So, as to your question; No, the water path mods are not very expensive, comparatively.
This is kinda cool man. I like the frost plugs in the roller block! Im doing a real 70 boss 302 in my 89 coupe. Just trying to figure out headers....I'd like find a single plane intake for it to replace the tunnel ram it has but I can't even find one for sale. Cool build man.
Where did you find a real boss block?? Super tough
I have a set of Hedman headers for a Boss 302 in a foxbody (used them in a Fairmont), and Hedman still lists them under part #85605 for all years fox Mustang and Capri.
If you don't want to spend $711 for a set of new Hedmans, I currently have my original '70 Boss 302 in my '86 Ranger, and I am fairly certain the headers I came up with for that combo would work easily in a foxbody. They are fairly short, for full length headers, and just 1 3/4 diameter, but combined with the full 3" exhaust I have on the Ranger, that is one nasty engine slopping over with evil intentions, IMO. At least I am very happy with it, and don't feel it is being choked by the less-than-Trans Am level headers.
The headers were some generic brand (Cyclone, Blackjack...one of those) for late '70s early '80s F150s with the 351M or 400C that I got off of eBay. The first set I tried for fit had the 2V port size, so I had to cut off the flanges and weld a set of 4V flanges on, but the second set I bought have 4V appropriate flanges..go figure. A little rough finish, so I trimmed them up a bit, but they fit well and work very well on the 351Clevor I have in my '72 F100.
Hope that helps a little.
@zweifelgarage1817 Sorry so long. Didn't see this. I got lucky. One of those stories, a freind of a friend of a friend. I didn't believe it when I heard about it. I said no way, it's not a Boss. But it turned out to be legit. Has the original heads and crank. Aluminum rods, 14 to 1 slugs, offy tunnel ram, huge comp solid roller. Going through it all, looks good. Be on the dyno soon enough to see what it really does. Need a faceplated tkx next then into the 89 coupe!
@@ZekaisI ended up getting those headman headers, I'm glad they would still make me a set. They look bad ass!
@@hotshothogger Glad to hear that! I really like those headers, they worked really well for me, and not nearly as hard to fit as Hookers and even a little easier than the old JR headers. Good hunting with getting it finished and enjoying it!
Any info on your build would be extremely appreciated!
its a Boss 302, a clevor is a essentially Boss 351 a 351W with Cleveland heads...
If I heard, you’re correct, you said you were gonna use original boss 302 pistons? I built a boss 302 when I was in high school around 1980. During the engine build I did some research on the engine. The two negative aspects of this engine are that the valves were quite heavy and at high rpm (7500 RPM) they had a tendency to drop a valve so we used lighter valves. The other issue was that the original boss 302 pistons had weak side skirts and they could break. I would look into this yourself. Ford made so many amazing engines but I have to say that the boss 302 is one of my favorites. How many manufacturers today can say that the race engines that they use today in NASCAR, Australian touring car racing, off-road racing professional boat, racing and many more applications it’s basically the same engine. They designed in the 1960s and early 1970s. Good luck.
Thanks for the info but I will not be beating on this car like ever really. Building it for a cruiser and to experience what everyone talks about how they suck driving in stop and go traffic
@@zweifelgarage1817 ok 👍. I haven’t heard that before. I think because the heads flow so much and the displacement is small you need to use tighter gear ratios on the street like 3.9 or 4.10 or you can stroke it a little bit to 331 to make it more responsive. Anyway have fun and enjoy yourself. It’s a great car.
Boss 302 pistons are only good for around 40,000 miles. After that they crack on the skirts.
This car has gotten driven 200 miles in last 4 years lol think I’ll be good
How did you get your hands on a XXX block? Ive been looking for sometime here in Illinois with no luck. Maybe its where I live or I am just not looking hard enough. Any advice Randy?
One of my friends actually gave me if for free as a shortblock. The rings were shot so had to bore it out
Whats difference between boss 302 and boss 351 heads? They same heads pretty much? Interchangeable? Nice engine!
The 302 boss heads have a coolant port in the front as the 351 does not to my knowledge
Hi cool build I have been wanting to build one for a while now I having a hard time finding pistons for my build on 289 Rods do You have part numbers and companies where I can buy pistons to mate with my Cleveland 2 v Heads I have the BA intake manifold Thanks Tom
You just use 302 crank ,289rods and boss 302 pistons ! Boss 302 used same rod as 289hipo measuring 5.155 !
great build mate ! but was there a part 2 ??
Not yet unfortunately, got hung up with my other projects. Will be finishing soon
You didn't notch the tops of the cylinders? Even cleveland engines have a notch at the top to allow clearance for the large intake valves. Those heads are pedestal mount rockers,boss heads and 72 HO have screw in studs from the factory. Gotta be careful because there are several variations of the cleveland head. 4V open chamber pedestal rocker ,4V open chamber screw in stud (72 HO) 4V closed chamber pedestal rocker,4V closed chamber screw in studs, for clevelands but OEM Boss heads will have the coolant passages set up for a windsor block.
Thanks for the info! First time here so I’m sure I’ll learn something by messing up
He gonna learn real quick how important those notches are ! Lol
I Never use piston ring pliers, you have to expand /stretch the ring to much..I guess you positioned the ring gaps off the Trust side of the piston. 1inch from the wrist pin centre line opposite side from each other on both rings is the correct fitment. Not random gap spacing....
I may be wrong but all boss 302 had 4 bolt main caps not 2 bolt
You must not of been listening in video. Used a roller block. Not saying this is a numbers matching boss
Those stock 289 rods are going to be the death of that engine
They might outlast the block l o l
@@dougjennings297 nah, those rods are just stock rods. God help him if he pulls over 6500rpm
You should have put the cam and first
You should have put the cam in. First In case you ran into any problems, you would not have to tear the engine back apart
I totally get that now! I learned that on a different engine. I have 1970 ford 302 heads on my roller block and the roller lifters wouldn’t clear the heads
Don't be revving above 6,000 with only 2 bolt mains
And those rods
Um. not a boss 302 then. OK, I will video building an actual 1970 Boss 302 that I am building for my wife's 1965 Fastback Mustang. Boss 302's, at least mine is O-Ringed, So is my Boss 429 which is the whole car KK2159. I was confused when nothing looked like what I have except for the pistons. I have the same TRW .030 pistons 11:1 is what I have.
Watch the video I never claim for it to be real… my twin turbo terminator would whoop the shit out of your real bosses. They aren’t fast what so ever just doing build for fun
@@zweifelgarage1817 You want your "whoop the shit out of anything you have"? Put up your money big mouth, I have something for you. entry fee for this race is $500K
@@zweifelgarage1817 Your Title is "1970 Boss 302 Engine!
Your a clown 🤣🤣
🤡
Making a fake BOSS motor.
Correct 🤙