Haven't had the head tested yet but have been doing some research into various methods of resurfacing of the head if necessary. Just a couple of questions :

If resurfacing is necessary, what sort of process should I be looking for - are CBN (cubic boron nitride) or PCD (poly crystalline diamond) machines necessary.

In other words what roughness average (Ra) should I be aiming for ?

Or are the older machines and techniques adequate ?

(Was part of another thread but was getting lost).