7th Darkness

iTrader: (15)

Is is possible to port and polish an aluminum intake mainfold? If so what would be ported on the intake?

Also could the intake opening be milled to fit a bigger TB?

LS1Formulation

iTrader: (13)

You could port it out, but I don't know what gains could be had. Most of the port work would be in the runner immediately adjacent to the gasket mating surface, but if it's not poorly cast with a lot of casting flash, etc., I can't see it doing much. Whether or not you could open the TB opening to a larger size would depend on how much material is there to remove. Most aluminum intakes have an 85MM TB opening and I know from experience that going from 85-90MM probably won't do much. I ported my FAST 78 to an 85MM and I probably have 98% of the performance of a 90MM intake.