"If the intake valve is a little too close to the piston, retard the camshaft by two degrees. This will delay valve opening and will increase the piston-to-valve clearance on the intake side.
The opposite is also true - a tight exhaust piston-to-valve clearance can be improved by advancing the camshaft. This will, of course, tighten the intake valve piston-to-valve clearance.
A compromise between the two just might get you out of a potential problem."
Per: Jeff Smith writing for Hemmings
