simple answer! the big port is good for turbo and the small port is good for natural. small ports help velocity of air into the chamber. this has been covered about a zillion times in forums and on 4ag web sites. im more than happy to elaberate just ask but there is alot to changing flow rates of the 4ag heads as there isnt alot of meat around the ports etc.
mick
Fri, 16 April 2004 11:15
