My buddy sent out his crower stack injection to have it dialed in at Kinsler.They want to know alot of details and one of them is head data.He has the 350cc Canfields and he cleaned up the ports.These were bare castings, had to have all the machinig done locally.I believe his port job was nothing too extravagant. That said,how critical is this information??Should he have the head flow tested? Could he use the canfield flow numbers from the as supplied "ready to run" 350 cc head? This is for a 540 BB chev with a 650 lift/264 dur @ 50, 10.25 comp.premium pump gas engine.This is for a lake boat,Southwind tunnel.Thanks.