Home Porting the Holley Carb!?....

People quote big numbers but I'd like sure like to see 100 cfm on a flow bench. If the air horn is cut off properly and then the edges carefully contoured and you use a K&N stub stack and you smooth the boosters and venturi you may gain 40-50 cfm max. You have to be extremely careful when smoothing the boosters too because if you take off much meat from the o.d. you'll cut down on the amount of air passing through the booster reducing it's efficiency ruining any cfm gain you might achieve.. I have done several Holley's over the yrs. and the gain really isn't nearly as much as you might think. IMO it's not worth the time cause that carb is too small for any serious stroker. I have a very mild 408 and am running a 750 HP and it's really not big enough to make max power