I cant answer for the 310 or 325 cfm ones, but food for thought...
My 85cc (really 83cc) KRE-D's cnc'ed by KRE for 290cfm
intake port volume is 190cc's I checked 3 ports on
one head, all right at 190.
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463 SRP .035 Pistons, Eagle rods, N crank, Pump gas, Victor intake, Holley 850BT carb, 6H heads,TH400 w/T-Break, Continental custom 3500 converter, 3.73 gears. TV7101 TURBO!
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