[68lemans462]

Originally Posted by FrankieT/A

The answer is right here in the original post...
455 heads on a 400. Low compression no flow...

Try some 12 heads or 48...even 62's would be better.

yep!! I'd start over with the motor or lower your expectations.

[HWYSTR455]

Originally Posted by 68lemans462

yep!! I'd start over with the motor or lower your expectations.

Well, I was kind of thinking more along the lines of at least first assessing the currently build before throwing a top end on it in search of more power. If it's a generic rebuild, stock rods, etc, then I personally would either leave it and drive it, build another on the side, or go into and build it in a performance manor.

Clay - Yeah, I've seen the same car dyno on 2 or 3 diff dynos, and the numbers were all over the place. That, and trans/converter also make a diff. You get a sloppy converter that slips 10%, on a 400 flywheel hp build, it makes a fairly large diff. You use a performance built TH400 with high line psi etc on a 350ftlbs engine, you're throwing power away due to parasitic losses.


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