Havok2

iTrader: (118)

what intake gasket would you use to port the intake side of the heads?
the intake gaskets, or seals, are just rectangular shape and you cant port that big...

so what do you at home porters use on that side?

5.3LJimmy

iTrader: (10)

I would not use any gasket to port the intake opening. That's normally done on the old small blocks to match the heads to the intake. You don't need to do that on a cathedral port head, and trying will most likely hurt more than help. The port entrance is large and pretty well matched to the intake as-is.

Havok2

iTrader: (118)

so just port the inside?

5.3LJimmy

iTrader: (10)

Yes. Just smooth the casting on the port walls at the entrance and be careful not to change the shape of the port or enlarge it too much.