My 470 stroker had those stage 6 heads. They were ported by Muscle Motors. Flowed 340ish by and 250ish at 600 lift. I used a .625 lift comp cam. I had the Mopar Performance blue rockers on it No offset. 0ver 700 lbs pressure springs. B block. Dynoe’d at c 655 hp c and 625 tq. Kim
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