I have a question regarding the cylinder head. What differences, if any, are there in the cyl. heads between a MC and MCS. According to the Bently repair manual the compression reduction comes from the MCS piston being dished. I have calcluated the volumes for the cylinder, and combustion chambers, and there needs to be more volume difference than what the Bently manual notes on the piston dish. Does anyone have the specs on the combustion chamber volumes in the head between the MC and MCS?