I just dropped my block and head off at machine shop. I have a stock bore z6 with stock length rods and vitara pistons, which ultimately leaves me with around 7.5:1 compression ratio. Frankly I am not satisfied with mid 7.5:1 compression ratio as a daily. So I told machinist to take .055 off the block and .015 off the cylinder head. .070 total mill. Should bump me back up to mid 8.5:1 compression. My question is will I have enough piston to valve clearance and also what kind of adjustments will I have to make with cam gear to accommodate the milling.