1964 grand prix

Asked by Nov 01, 2012 at 12:07 AM about the 1964 Pontiac Grand Prix

Question type: Car Customization

wanting to engine swap a 71 pontiac 350 to my original 1964 trans what problems might i encounter?

6 Answers

Let me start by asking if the '64 has the 389? When you ask what problems you might encounter, bell-housing may/may not bolt right on, motor mounts in same place, things like that. Let me do a bit of research to see a few things on that, maybe somebody here on the forum will know before I can find out though.But please let me know about what's in it now to begin. Many 1964 Pontiacs had the 389, the GTO, Grand Prix, Bonneville and the lesser known Catalina, which also offered a 405cid-- 400 hp, talk about a classic muscle car

1 out of 1 people think this is helpful.

Ok. By 1971 the 389 had been replaced to a standard 400cid with a 455 4bbl carb option, bothe with a way reduced compression ratio all the way from 10.25:1 to 8.4:1 from 1970, when leaded gas began to be phased out. They wanted to allow the car to run on regular, gas prices had become so high, all the way up to 40 cents a gallon. Imagine that. Getting back to your question, the Hydra-matic, Muncie 3 speed manual, or the Borg 4 speed manual were all offered, and all had the same bell housing bolt pattern, so there you go on that one. But I could find no reference that showed the 350 even offered in 1971, at least on the G/P.

1,075

DavidH25 The 64 GP used either a 389 or 421, no such engine as a 405 at least not from Pontiac. The 71 Pontiac 350 w/ automatic would have used a Turbo Hydramatic 350 transmission. The 64 transmission was either a dual coupling Hydra-Matic or a Roto Hydra-Matic. In either case, the 64 flywheel will have to be used with the 64 transmission. I think there may be starter mounting problems as the 71 engine mounted its starter differently than the 64. I think it would be easier to use a turbo 350 or turbo 400 transmission with the 71 Pontiac 350. I hope this helps out some and gives you some idea of the problems in marrying the two different generations together. Both designs worked well, just differently.

I blew it. Again. That's maybe the third time just this week I have posted misinformation, I was looking at the wrong car. Thank You for pointing it out and setting the record straight, you are right on, zoneman, when I went back and looked. I need to be more careful and pay attention in the future. The only reason I am not going to delete it is to keep the thread here in context.

1,075

David25, That's cool, as long as we're all onthe same page maybe we can help each other out.

Right on--

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