Originally posted by Tim Sanderson
How much are you thinking about "shaving" off? It's not a bad idea to have a couple thousandths removed to insure a straight, clean mating surface, but enough to increase the c.r. will probably cause problems as handsdown has stated. Valve to piston interference to name one possibility.
Oh ****, that's right! Our engines are interference powerplants which means that if the clearance is not correct the valves can meet up with the cylinders and really bad things happen from there.