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You don't have to have giant ports to flow good. In my storage is an AFR 1034, which is a street legal head for smallblock chevies, 195cc intake runner, 2.05" valve that flows up to 280 cfm at .550 lift and 28" depression. Exhaust flow is 76% of intake flow. I sure wish they put their magic to work on LA motors!

X2 those heads bring a tear to the eye, but they'd be better w/ shaft rockers.