Of course in Newbomb's world, only 45* or larger makes more power. In the real world, it is different.....
MM Muscle magazine did an in depth porting exercise on BBM heads, about 20-25 yrs ago. Spread over a few issues. I have them, have to dig them out. Pretty sure they went to a 2.14" intake valve & 30* seat....& got more flow.
