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Old 01-20-2015, 12:34 PM   #11
Tony Corley
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Join Date: Nov 2011
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Default Re: Ol' Fart's Firebird Fantasy

Quote:
Originally Posted by oldskool View Post
Nope, the '72 400 has a 310hp factor. The 455 is only 315. It would be better. But those 455 heads had press-in studs and no end exhaust manifold bolt holes. And I don't have a set anyhow.

A '75 GP with a 455, factored at 300hp looks pretty good. And they show the 5c heads are legal on it. These heads are almost identical to the 6x heads that I have. And they have screw-in studs and all 6 exhaust bolt holes.

But, I just noticed that NHRA does not list any accepted replacement piston for the '75-'76 455's. They must be oddballs of some kind--maybe a bevel around the edge, or no valve reliefs. Anyhow, a barely under car at a divisional will most likely not be torn down to check the pistons. And I assume that if somebody requested it, NHRA would probably allow the same pistons they have listed for '70-'74 455's, since there would be no big performance advantage.
I meant buy it and sell any of the running gear you can't use. You could easily recoup $1000 or more in parts sales, and have a chassis basically ready to drop your stuff in. If you don't have the required heads, I'm sure someone else does. You are letting the minute details get in the way of racing, lol. Not too mention the '72 is way more cool than a '75. As mentioned earlier, years ago I had a 71 Monte Carlo SS 454, which obviously this is the Pontiac equivalent body style. Would hook in mud.

Last edited by Tony Corley; 01-20-2015 at 12:37 PM.
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