Inliners International Forums General Discussion Engines 261 chevy 848 porting

Most leave the intakes ruff(80 grit)I myself stay at 80 grit for the intake ports an 100-120 for the exhaust The smoother the exhaust the better. That will lessen the chance for exhaust carbon build up.Because carbon has a much harder time sticking to a Smooth surface.The ruffer it is the More likly it will build up and slow down the exhaust gases.Gasket Matching is also at the top of the list at the very least.It removes any lip between the intake and the port and the same goes for the exhaust.