Still wish they'd rate em by CFM Mach rather than bore size. I know Accufab gives the size and flow rating for theres and I remeber when MMFF did a comparo on a 427 sb but they had a mix of units. If I remeber correctly the accufab 75mm flowed 840 cfm? not to mix nuts and bolts here, but chevy's stock tb on the LS1 is a 75mm unit and I think it flows in the neigborhood of 780 cfm. I rember I tried to pry the info out of Edelbrock in their 75mm unit and they said to call BBK, got on the tech line for BBK and well I think I just hung up cause it was taking more time than I had to wait. Never went back for a follow up so I dunno. My 347's gonna need in the neighborhood 700-750 cfm to get me where I wanna be powerwise.
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