air in air out all u men. think of this. smooth intake.smooth heads. I am. talkingabout porting. Flow is in every thing.heads polish intake polish as hospital. most engines I have found LUV 3 to 4 times fuel,than stock. Cams stock 4-speed are most time the gods best all round auto and all. At being 60 I have found (sp) foot and ahappy mind. helps a lot. But no really on stock stuff .port clean . fac has done all the test or you would be able o2 by. so more fuel and like dyimite.