As Brad said, std port intake on spacers on an RB block, std offset rockers and straight plugs = original stage 6.

And ditto on the seats.

The heads only come with intake seats that are 2.187”........ and don’t go very deep.
If they haven’t been replaced already, they need to be.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads