Quote:
Originally Posted by bigjimzlll
That was on a REAL dyno,not some made up..need to sell parts...magazine fiction story.
Yes the heads are the limiting factor. How much does the GM 572 make?
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The GM 572 crate is a turd and designed for a warranty. I'd be willing to bet anything that with a good tune and the right parts combo, it makes well over 720. I did not know the magazine articles used fake dynos.......
720 on pump gas with off the shelf parts from a 496 is very doable and I'm not justifying the articles......what makes that so hard to believe? I saw a 509 with a small flat tappet cam unported 990's make 600hp @ 9.5:1 cr.