SM Head Modifications on a budget

273 said
What port height do you get out of them ?

Earlie A posted stock pinch height as 2.08"

2.08" x 0.95" = 1.98"

1.98" x 1,100,000 / cid = rpm, 367 = 5,935 rpm, 408 = 5,338 rpm

2.08" x 1.015" = 2.11"

367 = 6,324 rpm, 408 = 5,689 rpm

I Never ever measure the roof but I aggressively raise it and square it up.