HOW TO: FIX THE DODGE SLANT 6 (WHAT BROKE?)
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- Опубликовано: 14 мар 2021
- THE OTHER GUYS-DODGE SLANT 6, DIAGNOSE AND REPAIR-WHAT HAPPENS WHEN YOUR SLANT 6 HAS ONLY 5 GOOD HOLES? AFTER ARRIVING AT WESTECH WITH A FRESH (MEANING FREE AND USED) 225 (SUPER SIX) SLANT 6, I DISCOVERED I ONLY HAD A SLANT 5. THERE WAS ZERO COMPRESSION IN 1 CYLINDER. CHECK OUT HOW I DISCOVERED WHAT WAS WRONG AND HOW WE PLAN TO FIX IT! WE NEED 6 GOOD HOLES TO START TESTING.
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Finally of all the slant 6 videos out there, someone is actually going to show experiments! I daily drive a slant 6. Glad to see this being done!
Twins both model 270 both California built, Hers is still Slant6 and mine is now 318 1968 Darts... both daily
instablaster
I was daily-ing a VC Valiant 225 with four barrel and long runner manifolds till recently - and swapped to twin 2bbls when I pulled the head to start matching ports on the HyperPak clone.
Now with all the 2020/2021 restrictions, the daily is a Voyager and I'm wondering, will a Jeep 3.8 fit in the VC?
You should get that head Uncle Tony offered you. See how much the poor man's porting job does.
I’m living in Colombia and there are a lot of 4 door darts with slant six’s down here for cheap. They used to be a popular taxi option back in the 70’s. Unfortunately most are tres en el árbol but I think I’m up to the challenge. I’m looking forward to your progress amigo!
So happy to see you toy’n with the “leaning tower of power”! I built a turbo Intercooled Slant 6 in my Plymouth Duster with a blow-through setup (vids on my YT) but I’d love to see you weld in some bungs and build a fuel injected version!
Hell Yes! I second the motion! 😁
I can't wait to see where this slant six goes. I've always been fascinated by the slant 6 and want to build one eventually
I've got a 170 for sale
Budget as if it's a Big Block.
I am so glad you’re doing this, my grandfather passed down a 84 dodge he bought new and it has a 225 slant 6 in it. I got it and wanted more so I fabbed mounts from a factory ls mount and some solid dodge mounts and put a 5.3/4l60 in it. I almost had it done and decided it took to much away from the truck and I wanted the original slant 6 to stay so I pulled the ls out and right now the slant 6 is sitting in the engine bay but haven’t finished bolting it back in. I’m definitely planning on going to a power adder.
Three Weber DCOE side draft carbs.
Really really interesting slant build. Lots of head work, cams, intake manifolds, and BOOST.
I rebuilt one of these in the mid 80's, an absolute pleasure to work on, do it right, treat it right and they reward for years.
Ritchie you need to step up your engine noise game , how come the inline 6 and the V8s sound the same ?
I've had numerous slant 6s in Dodge pickups and vans towing my 327 Chevy drag cars. I loved the 327 and this little slant 6. Glad to see somebody is interested in applying some new tech to this old workhorse. Thanks Richard
Thanks for sharing!
I just bought a 85 D150 with a /6 and 833 OD. Really good shape except the bock is cracked. He didn’t have enough antifreeze in the mix when we had single digit temps in December. Shame too, starts right up and runs good. I’m swapping a 318 magnum in it in a couple months after I finish the rewiring my Ramcharger. Slowly both of them and my 340 duster (clone) will be swapped to 3G Hemis.
Did a cam, headers and Offy 4 intake with a Holley 600 in a 71 Dart yrs ago. Ram 14.60s at LVMS during MATS.
Looking forward for the updates on this project. The slant six was the first engine i worked on with my uncle in 1983.
Can't wait to see more on this. I have a few slants. Building a Clubcab Shortbox PowerWagon with a Slant for my wife.
Think its terrific that you cover every possible option. Be great to see a test with the Aussie Speed manifold as a compartment
I'm new to the slant 6 community seeing this video gave me a little understanding about the slant 6. hopefully I will have my slant 6 up and running one day.
It will be cool to see how much power this Slant 6 can make! Looking forward to see the results!!
that much piston to deck clearance was a common thing on some of the smog engines in the 70s. i saw a 454 that had close to .060 below the deck and with a .039 head gasket. that almost .100 of quench distance. that 454 was a lazy pig.
little known fact 73-76 Ford 302's had slightly higher decks than standard 289-302 deck height. that's why you need a thicker bead of rtv on the intake end seals
360 LA with .070 + down the hole. And that was 1975!
Good you found the problem. Looking forward to upcoming videos. Here's a tip in case you didn't already know... Those two bolt holes on the top of the cylinder head can be used to lift the engine. That's how they did it at the factory apparently. I've done it myself too!
Seen some wicked 6s at the track! Can't wait to see what this one puts down on the dyno especially being turbocharged🤜💥🤛🤓
If you need a slant six cylinder head, my brother and I found a freshly machined one in my Grandfather's basement after he passed away, just pay shipping and it's all yours! We're in Wyoming so I'm not sure how long it would take to get there.
Besides the Hemi the Slant Six is my favorite powerplant. Wish it was still made.
Somebody used to make a side draft manifold with three 45mm DCOE's for the slant six, do that!
Here in Oz they have been putting Webers on them for near 60 years!!
I doubt that for road racing at least the maximum has not been extracted from them. A few still raced in historic GpN. But they let Mustangs race and took away any edge the Valiants had in pre65
I'll be following this build. I built a /6 years ago with the help of St. Moritz in Tulsa. We put some bigger valves in it, which Uncle Tony's Garage says is a bad thing. So I've been thinking of pulling it apart and seeing if we can reduce the size back to stock.
I learned how to wrench on cars working on a slant 6. Those are great engines with good longevity. You darn near have to beat them to death with a sledgehammer to make them quit. I still (after 60 years) have a lot of affection for early mopar cars. I am looking forward to see what you do to that little mill. I assume it's a 225 CI. They also made a 170 CI slant 6 for smaller cars like the old Dodge Lancer (60 & 61). Learning to work on stuff like the slant 6 led me eventually to get my Air Frame and Power Plant license to work on small aircraft as my 3rd and final career.
The last /6 I built: Stock bottom end with windage tray and Melling oil pump. Late model head to get rid of the spark plug tubes and also have hardened seats for unleaded gas. 340 vavle springs and the Mopar (Crane) .460 lift solid cam. Accel Super Coil, Offy 4 barrel manifold with a Holley 600. Mopar 6 into 1 header, single 3" exhaust through a Flowmaster muffler. Car sounded like a 340 at idle, ran hard for what it was and was great to open the hood when people didn't believe it was a /6.
Really excited about this build! The Slant is an enigma in motor design. Boost it Baby!
YES YES YES. I'm researching doing a turbo slant 6! Can't wait to see the tests!
This will be fun. With a little massaging, equal-length intake runners and a bit of boost it would be respectable.
Easy way to that, is the Clifford HyperPak, which while hard to find, will be easier then the factory HyperPak.
The Super six was my fist cars engine it was in a 1979 Dodge Aspen 2 door red on red interior with R/T side louvers it was a awesome car I had crager rims on it with slapper traction bars to make it look cool. I had so much fun in that car and wish I still had it
I've got the Aussie Speed Hurricane long runner 4 barrel intake and the Dutra exhaust manifolds on my /6. Have not driven it yet, but it sounds like a beast now. Hopefully I can actually drive it around the block this week.
Had a slant-six in 67 Dodge D200 step side, crew cab (former airforce truck) back in the day, wish I still had it...
subscribed, finally a test that has not been done a 100 times.
The Super Six 2bbl intakes can be two piece die cast aluminum top and bottom and what looks like resistance welded or the cast aluminum like featured on this engine. I cut the exhaust manifold outlet off and welded a 2 1/2 inch flange. This also isolated the intake from the exhaust manifold as well as having a 2 1/2 inch exhaust and that gave a seat of the pants feel increase in power. '74 Duster 904 with 2.71 gears.
Deserves a follow! I’ve got a couple slant sixes stashed away, gotta see what I can do!
from the looks of the exhaust valves, I'd take a really close look at the condition of the exhaust manifold. They're notorious for cracking (early ones are better) and judging by the looks of yours, I'd bet money on a cracked manifold or leaking flange gasket.
Milling - IIRC, 120 thou is the heads limit, 90 thou on the block, and if you do, watch the the cam lift to make sure minimum .050 between open valve and piston at TDC.
Parts - Clifford Repro HyperPak, Pacemaker tuned headers, Cox Bros make roller rockers for slants, and there's good pistons about. Someone was doing seven inch H-beam rods too for a while, which is the whole 198 rods in 225 block to bring the pistons up higher.
Very interested in this build.
I'm putting one into a '46Plymouth business coupe.
LOL, yep, the exhaust valves all sunk into the head from lack of leaded fuel. My 360 did that too.
u gotta love the analog sounds effects in richards vids
old school was a good school ;)
I used to have an ex-military Dodge water truck with a 1000 gallon water tank on it. I shit you not, it was powered by a 225 Slant Six!
They are a great lugging motor
I knew a brick layer who had a 1 ton Ford with a 300 straight six that he would load down with literally a ton of bricks. He replaced it with a newer 1 ton dually with a 460 and he said the 6 beat the V8 in both pulling ability and fuel mileage.
@@chris49ford Id like to see a 300 I6 with ridiculously long gears. Mabye 2.40 something rear and a .60 overdrive.
Bolting the early '80's Buick 3.8 draw-thru turbo setup on a stock compression Slanr 6 was claimed to double the power.
Between milling everything and the big cam & turbo installs this might be a 'Reycling Yard' approach.
Thanks for building a Slant 6.
Love the Slant six videos, anyone can get 1300 hp out of modern v8s but to break 300 hp on slant six ..its going to make you earn it Richy! Defiantly cool You're doing a slant six!!
What happened to the Slant 6 testing? Old guys want to see stuff like that!
Have a slant in my 67 valiant plus extra one on garage floor... all stock....CANT WAIT FOR BOOST
Hey Richard; Your probably already aware of this, but torquestorm makes a lot for Dodge slant 6’s. Idk if you still possess the torque storm supercharges from the testing you posted last year but, if so, I bet torquestorm would send you the adaptor-plate / lower-pulley to run it for them....that would be a cool test!!!
Good to see that you are back on the straight sixes. What is the plan with the 292 Chevy? It has been 7 months since you last tested it.
I've always been intrigued with the idea of running 3 side draft carbs on a slant 6. Maybe 3 off a HD Sportster. I'm thinking the math works out for that combination. Love the videos!
I think there is a company out of Australia that make a side draft manifold for slant sixes
I'm curious how this ends up thank you for covering the great 225 slant six. The sound of that engine bring back fond memories of my youth.
Can't wait make sure to stud it! Possibly piano ring the head block surface lol it will probably just going to lift the head or blow the head gasket thats alot of surface. Good luck! Thanks go make gobs of torque go for the slant 6 record!
Make sure that rod isn't bent. I've had my fair share of incidents requiring head removal on a couple slant sixes and never seen the piston sit so low at TDC.
What you driving changing all them gears....49 lambagena panel wagon safire Blue...👍👍👍👌👌👌
The slant 6 was a very dependable motor if you took care of it!
Thanks Richard.....Really looking forward to this!!!!!!!!!!!!
Need to find part two, three, Four on building the Slant Six! Richard?
Love the engine noises when shifting and moving the engine hoist.
Even with lead the old engines would burn valves and seats. In order to keep it cheap and get a stock running reading I would suggest a new set of stem seals on all the valves. That is if the sticking valve didn't take the cam out too.
Had a 75 Dodge short bed back in the 80s. It had a 225 slant 6 in it. Almost used more oil than fuel. 16 mile per gallon of oil. LOL!!! Forgot to put a gallon of 50w in and a rod started knocking. Tried to finish it off but it just wouldn't throw that rod!
Loving this project already, and I can’t wait to see more! I got so excited when you said you are going to run a turbo setup! That will be awesome to see! I have an 87 225 slant with an A833 4 speed in my 87 B150 short wheel base van. I would love to make it a turbo slant sleeper! I’m in the process of doing the head gasket, and replacing other basic stuff on the accessory drive. Can’t wait to drive it again soon, maybe with some performance upgrades from all the inspiration in this video! 😎🤙
Looking at the combustion chamber shape, there is no real quench. So zero decking does not really help much ... Yes, compression does help for sure, but taking enough metal off the deck to get to zero with OEM pistons is kinda chasing a ghost ... Better to go aftermarket pistons and leave the deck thick enough to hold the bolts for boost ...
The 225 is still a small engine. Almost wish you could grab one of their (Mopar's) big flathead six's like the original 413 twin carb truck motor and do the same to it 🙃
Btw can’t wait for this build!
If you offset grind the crank can you get the piston up to zero deck and get more stroke in the process?
Hi 👋 👋 👋 👋 Richard hay I was trying to find the follow up on your slant 6 just wanted to know all the test on it. So hope to see more on that engine I wouldn't mind see a Torquestorm supercharger on it I saw they make 1 for that engine and they are cheaper than procharger brand. Going now thanks Ray in Idaho
Coming soon!
I'm super excited about this.
Hoping to see an AussieSpeed long runner intake on there with a sideways mounted 390 or 465 Holley 😍🇦🇺🇺🇲
Nup. Aussie Speed if Injected and boosted, sure, but N/A Carby, get a Clifford HyperPak, and bump up to 650cfm.
Slant 6 is an odd duck. Chrysler leaned the engine over to clear low hood lines. Only reason. Then they put the water pump on the side to shorten the engine for styling fit. I don't know of any other single engine that gets dedicated race days at drag strips. My daily driver for the last 15 years is a 1965 Valiant. SLANT SIX!!! BUZZIN HALF DOZEN!!! MOPAR OR NO CAR. ruclips.net/video/ZPm0POxQuNk/видео.html
Those sound Effing GREAT!
For some reason reminded me of the USGP formula 1 races at Long Beach back in the late '70s.
Thanks for the link!
"Stop when we see the problem,.." Exhaust on number five should not be covered in oil, and the front three have been running lean, all thee need new seats, so might as well do the whole head.
It's always a laugh to watch first timers go to lift the head off a Slant - done it enough to use an engine crane :D
Now it's apart, can I suggest the Clifford Performance Reproduction HyperPak inlet manifold, and the Pacemaker 'Tuned Length' extractors.
Yes, you can skim the head and the block, bore it, offset grind it, add a cam,... but none of that matters as much as making it breathe.
Great video, thanks!
Down the hole piston is just "boost ready" , needs patent pending holdener universal turbo kit to check conrod integrity.
Woohoo! Some Mopar motorvation from Holdener! So happy!
That engine has been played with. That style cylinder head with the spark plug wells predates the 2 barrel carburetor. Likely a 2barrel manifold and carburetor were retrofitted to an earlier engine.
I had a Mopar Performce engine build book. It had recipes for all the engines including the slant six. I think there was a recipe to make 300hp from the 225 NA.
300 hp na is very hard with the available head flow
Was that a leaded motor running on unleaded fuel so it beat the exhaust seat out of it? Sure looks like it.
I don't think so. By the time the Super Six was introduced in the USA all cars had to run on unleaded fuel because they were equipped with catalytic converters. Chrysler had offered the 2 barrel version for export but did not offer it in the US until the late 1970s or early 1980s because they preferred to sell the 318 V8 to those who needed more horsepower than the Slant Six could deliver.
@@1575murray All US cars made starting for the '73 model year had to have an EGR valve to reduce NOX emissions. I do not see an EGR valve on this engine. Maybe somebody put a '77 and later Super Six intake, carb, and air cleaner on an older Slant Six?
Chrysler and other auto companies induction hardened valve seats to make them last when lead was removed from gasoline. This head should have had hardened seats because only one seat was damaged. Induction hardening valve seats was only a surface treatment and after about 45 years of service, I do not think it would be unexpected for this process to start to fail.
@@fustyblatherskite2142 You are correct. Actually this started a year or two before unleaded gas became mandatory in 1975. Anything can happen on engines that are this old.
I saw you loosen the head bolts using the typical tightening pattern from center to edge. Why? I've always loosened in reverse order of tightening. ie, from outside bolts to center bolts.
That sure is a unique looking motor. I kinda like it 🤘
Do you have video of replacing exaust manifold on the slant six
Always love inline 6 stuff!
I got a 200ci Ford Mustang. I want to put a 300 in but I am not sure what I would need to do to fit in. Also wanted to ask if there were inline six parts that are interchangeable
Everyone blames the lack of power on the head having both ports on the same side . It would be interesting to see an aftermarket cross flow head shoot out before and after. You'll have to go with a Ford six for that test though.
I cut 0.150" off the deck surface on my slant 6. Pistons were down 0.170".
0.150-inch is a lot even for the slant siz
@@timothykeith1367 I cut 0.070" off the head too.
Getting pistons that come near the top of the bore is far smarter
@@ldnwholesale8552 I agree, with the technology available today, pistons can be custom made to any spec desired. back in the day, the block and head milling was the best compromise of money and tech on these engines. Now you can get almost zero deck height with just pistons.
@@ldnwholesale8552 I guess I'm just dumb. Strangely, it works well with low cost stock pistons. Was in a nostalgia dragster, now in a hot rod. Not many choices unless you want to pay for custom forged pistons. If you want to donate to my next engine build, I'll accept.
Have you posted additional videos on this build? Can’t find them anywhere
Great project
Got to do the valve adjustments in a LT of P . Whoever owned it just drove it.
Was looking forward to the continuation of this series. Is it possibly it’s on another page?
have not run yet
If this is a forged crank block (75 and earlier), you can use rods from a 198 and 2.2Lturbo pistons. Gives you strong modern piston at -.020 deck height.
its cast (later super six)
Broken pistion rings are mildly common in these things, my 1969 had a broken ring, presumptuously from factory. The og owner said it had a littel miss and shake when he bought it off the floor never could figure it out. Hopeing to get comp. up to 9.1:1.
Is the cost for this amazing rebuild affordable fpo rt the average guy?
Why not offset grind the crank to get that piston to the deck? I'm guessing it will require valve reliefs then? I know little about 6cyl's but like all engines, more compression, more air more fuel, eq, more power! I have gotten interested in the 6cyl engines, after seeing the 300ford with Cleveland heads, cut and braised, that car was beating V8 cars! I want to build a Chevy version, maybe use LS-1 heads, custom cam of course, braise the deck re drill if needed, but just buying a vortec 4200 would be much cheaper!
My 1st thought was boost for the slant 6!
6 cylinders firing is always better than 5 cylinders.
Pretty rare for those Solid old Lumps to go wrong . Very Bulletproof old Engines . Not known as the Leaning Tower of Power for nothing , either .
Pumped about warming this motor up!
Keep the slant 6 videos coming!
I had a 1966 Valiant that was rated around 145 HP. Mid-70's Chrysler made them with 95 HP. They were so weak they cautioned dealers NOT to get ( they were in Volares ) them with manual transmissions because they did not have enough HP to start out on a incline. Of course our dealership got one and therefore the proud owners experienced this phenom.
This is going to be interesting!!
One of the very first engines I learned bore sunnen boring machine wow
Richard I have a general question on Dual plane intake manifold. Is it the runner length that makes them produce better torque and all around power or is it the design in the inlet where it has the two different platforms?
its more than runner length on the dual plane
A quench pad in those chambers would help alot
Hey Richard - they used to offer 11.5:1 pistons for the 225............
What about fuel injection? There's a company called Gill Welding and Fabricating who makes a multiport intake. I've also talked to someone in australia who converted there's to coil pack ignition and if you want to test a roller cam LSM Engineering might have a few blanks left. Either way you go I hope it helps build the slant community. Then maybe people will finally start making more performance parts lol.
that head was designed for "leaded" gas, if run on "unleaded", the valves seats will go away, either harder valve seats are needed or lead substitute must be put into each and every time gas is put in the tank.
new seats cure that-and I would think slants from the 70s had hardened seats