Highest flowing sbm heads?

Yup, 2 HP/CID on pump gas is playing in rare air.

that P7 deal mentioned earlier that makes 850@ 358 inches could possibly be a contender.
not sure how much power knocking it down into pump gas range would make it( I have huge respect for compression) end up at, but 850 horse to 715-720 is quite a bit that would have to slide off.
Man are those heads good:realcrazy: