slant 6 head shave

66aCUDA said
I think about .007 is 1 cc so do your math.
Frank

Charrlie_S said
Actually you need to cut about .020 to maintain stock CR, when using an "aftermarket" head gasket. If you don't want to do any machining, use the OEM steel shim gasket. If you are going to mill the head, any way, just allow the extra .020 for the thicker gasket. I am running a head on my 66 Valiant 225, that is cut about .125 and the chambers are 39 cc's, and the shim gasket. This is a strip only car.

Frank, using your math Charlie would have had to cut .147 off his head to get 39cc's. I believe you that advertised compression is less than what the factory states. WOuld be nice to know an exact formula though. As far as where I got my info, can't remember, some slant 6 forum? NOt this one.

WHat is the mechanical limiting factor as to how much you can cut off the head?

ALso how much would you have to cut off to get 10:1?