Has the intake been ported or is it as cast? I know those are pretty good intakes as cast but porting will still help a bit.
I bought the intake used, so I don't know the history. Visually, I can see some clean up inside. But I don't know how much.
The intake manifold exit openings are slightly larger than the Koffel gaskets. I "ported" the 3/4" thick RB spacers to transition to the even larger heads. Then I used a Flat Out Gasket that had the right size openings .
More info on Part 5 build notes.
Link to Part 5 - intake
