That will depend on what head gasket you use the SVT head gasket will give you a lower compression because it is a thicker head gasket , the head itself from what i remember is the same CCCatMostFeared said:with a zx3 head (non svt) and SVt bottom end how compression will this be.
I don't think it'll be that low...zx3 and svt heads have similar combustion chamber volumes, the increased compression on the svt is due primarily to the pistons, so it'll be closer to 10:1 unless you change the pistons outCOSDEVSVT said:~8.9:1 with SVT gasket
~9.2:1 with Zetec gasket