Well, it's time for me to look around for some different heads as I've got
stock "624's" on my 350 . Am looking at a couple from World prod. and was wondering just how much it would change comp. ratio going from 76cc to 67cc with everything else staying pretty much the same? Would I be better off staying with 76cc as this is a fairly stock build still? Crank is stock but only a couple months old and cam is also fairly new. It is a summit house cam with 204* in. and 214* ex. with lift at 442 in. and .471 ex. with 1.6 rockers. Oh, forgot something, 67cc chambers has an intake runner size of 165cc and the 76cc chamber has 171cc runner. Also, holley dual plane intake and holley 600cfm. with vac. sec. I welcome all thoughts as I'm one of the more un-knowledgeable ones around this site. Thanks