Dear RR;

Do NOT shim the rocker arm assembly.

When 'large amounts' are milled from the head the intake valves are 'sunk' into the head to compensate etc.

Simply put a 'straight edge' across the head & see how much clearence you have.

Good luck. \:\)

John M., I.I. #3370

"There are no shortcuts to any place worth going". -Anon