Quote:
Originally Posted by hill67bird
I would like to see a back to back comparison on a 600 hp engine. I am thinking about the RA manifolds for my 65 gto but don't want to lose a lot of hp. Looking to build a 600 hp 428 engine with 4 speed trans.
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I may be thinking wrong, but I believe the cast RA manifolds have fitment issues in the '65 frame. So check if you go that route.