Originally Posted By fast68plymouth
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.



Why Chrysler used seas like that I have no idea. They did it on the W-5 heads too. The first step on heads like that is a seat replacement with a quality ductile iron seat.

Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston