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Steel with a Magnum gasket on one side and an LA gasket on the other. They aren’t gaskets themselves.

Please post pictures of the parts before welding as well as after. Dying of curiosity to see it. :thumbsup:

Interesting that the 5.7 and 6.4 G3 just about hits that ratio perfectly. Add that is has a 9.25 deck height, I think.

Hey what radiator are you running? I started a thread and tagged you in it at the end asking for help on radiator hoses for a Cold Case radiator. Guessing you didn't see it. BTW, tried to PM you as well, but your inbox is full.

Based on those pictures, I would say they do not have enough meat to seal a 340 exhaust manifold. I tried to find a picture of an early Magnum head that had enough meat and came up blank. I know my buddy had a set when I was doing my swap, but guessing they are an early set only because...

@dartslantsix and @75slant6 are/were running an Ax15. Dartslantsix had his for sale several months ago. Either way, they should both have some idea of how they work in a car. Also, the AX15 and R154 have the same bellhousing bolt pattern. As does the AR5/MA5. So you could start with an AX15...

The problem is the bottom of the port. That line at the top of the gasket port is the bottom of the cylinder head. There isn't any material there to squish the gasket and create a seal. Some Magnum heads drop down further, mine and the OP's did not.

SendCutSend can cut stuff for you. I have a pattern I gave someone here recently for this exact reason. Can't promise it is a perfect fix, I have the same problem (Magnum R/T heads with 340 manifolds) and my adapter plates seem to be ok. But I have leaks I haven't identified so it could be...

Wikipedia says the Viper motor was LA based, so it must be true. Right? Viper engine - Wikipedia

I don't think there is a part that will swap, but the V10 is definitely SB based.

To be clear, I'm not trying to change your mind or anything. Just didn't want anyone thinking that all 383's had real compression. I agree, to each their own. Myself, I've always wanted a BB Duster, just love the idea of it. I did have a Duster I was going to swap, even bought a '75 400 for...

Sure, but now the point about one having higher compression is mute since both would get whatever compression the builder decided.

Not all 383's had high compression, the 383 2bbl had pretty much the same compression ratio as the 360. Agreed that the 383 had a high compression option that the 360 never did, but I would bet most 383's someone drags home to drop in their A-Body are going to be of the 2bbl persuasion. And...

I got it. The '71 340 was the last year for the 2.02 heads, right? I bet when the 340 and 360 moved to a 1.88 head they picked up power. Has to be the difference. :rofl:

Looks great!

@JBrian what radiator did you use? Kind of looks like my brothers Cold Case radiator.

For me, I think the decision between a 360 or 383 is too project dependent to say which way I would go in a theoretical thread like this. I think the 383 has some real advantages over a 360. I think the available aftermarket BB heads are better and I like the shorter stroke and bigger bore...

There is a European team that campaigned a V8 Viper by disabling 2 cylinders in the V10 block, and they did pretty good. The Vipers were dominate so the other manufacturers got the rules adjusted to slow them down and the team found loopholes to keep competing, and winning, with the Vipers...

It's kind of interesting (to me) to compare the rated rpm's for these motors. __________HP________TQ '71 340 - 235@5000 - 310@3200 '73 340 - 240@4800 - 295@3600 '74 260 - 245@4800 - 320@3600 Doesn't make sense to me why the '73 340 with lower compression and a log manifold on the right was...

I wish they had done a V8 Viper based motor. Bet it would have competed with the LS.

This page says the '71 340 (Note - not detuned) net rating was 235/310. https://www.hamtramck-historical.com/images/dealerships/DealershipDataBook/1971/71_Valiant_Duster_14.jpg '74 360 factory rating (still net) was 245/320. '73 340 was 240/295. Still factory ratings so they could have...

He sold the car??? Hope things didn't a take a bad turn for him or something. We didn't see eye to eye on some things, but I don't hold any ill will towards him.

:rofl: Make sure they are 6" long or longer, too. At the same time, the 4x4 guys are always talking about putting 8 lug axles under their trucks. A 10 lug setup would be the bomb.

Yes, I believe that is @'68cuda416's car

I think a 5.9 should be a part of the discussion, it's still a 360 and bolts into the same spot. Most A-Bodies didn't come with a 360 or a 383, and if someone were to be looking at swapping a 360 in, the Magnum is just as much an option as a 383 out of a Roadrunner for the BB swap. If not more...

Just need to double drill the hubs and add 5 more studs each. :rofl:

1964 Plymouth Valiant with Gen 3 Hemi

383 4bbl '71 Cuda would be the same as the '71 Challenger posted earlier. Looks like the only 4bbl 383 available in '71 was a 300hp detuned, 8.5:1 motor, probably with the 2bbl cam. Never noticed it before, but looks like the '71 dealer info shows both rating systems, and says 250 hp and 325...

Struggles to find an earlier 383 in Pure Stock Drags results. Finally found a '69 Cuda 383/4M/3.55 with a listed weight of 3660. Time shown was [email protected].

For comparison sake, the '70 AMA specs for a Barracuda/Cuda list 3 separate 383's: 2bbl - 290@4200 4bbl - 330@5000 4bbl HP - 335@5200 The 2bbl and 4bbl both show the same cam (256/260), but the 4bbl HP shows a 268/284 cam.