i have an ls swap in an eg i put the motor in and it ran on three cyl. so i checked compression and low on #1 so i take my head to the machine shop put some valves in it and milled the head. i put the head back on and no start at all less compression then when i started on all 4 cyl now. would the adj on the valves be out now? i cant get a feeler gauge in between the rocker and the cam so any imput would be rad.