oh sorry...I was wrong, your casting sucks. sell them to me.
Ok here's what the book says:
are all hot castings.
These castings were originally equipped with 2.06" intake and 1.72" exhaust valves. FOr high performance use, these heads are routinely fitted with 2.19" intake and 1.88" exhaust valves.
The little...very little information about the heads was about the most useful information in this POS book I got. It goes on to talk about rectangular port heads...and says that for anything less than full-tilt racing they suck and do not flow as well at lower RPMs as the above listed heads.