how does milling the cylinder head affect the valve timing??

[pishta]

Originally Posted by 907mge

The 7mge is a non interferance motor to begin with, so no. The only thing it will do is raise the compression a bit.

Wrong...the cam timing will be retarded because the cam cog will be closer to the crank cog and will roll CCW a smidge. You can only mill an OHC about .02mm before you need to cut and use a "head saver" shim. these are usually .020" an allow a .020 cut on the head or block to preserve factory valve timing.