[charlie66]

Originally Posted by blaktopr

It's going to take work. Not easy especially with guide plates. How bad are your current pushrods flexing and touching the head? How many more pounds per square inch does 30 to 35 lbs of boost add to the valve? 70 something? Tom? So if the pushrod sees 300 lbs closed with boost and valve spring pressure why can't 3/8 120 wall work. Call butler and see what they say.

Here are some pictures. what do you think . Are they flexing and hitting?

Exhaust is on the left and intake is on the right....

These r the butler .116 wall at 9.500...