Enlarging PRP doesn't always help

PRH said

Is that with the seat at the “std” height, or after you’ve lowered the valve in the chamber .090”?

Click to expand...

Good observation. All of my steep top angle testing is with the valves sunk in the head. So that means both the 50 and the 45 were sunk. The additional shrouding of the steep top cut hurts low lift flow but helps on the top end (I think).