Do you even know what your quench is? How deep in the hole is the piston and what is the compressed thickness of the gasket? I know on my 347 the piston is .015 in the hole and I use a .041 gasket which gives me .056 quench and the compression comes in approximately 9.18:1. The old 302 had the same .041 head gasket but was .030 in the hole and the compression was approximately 8.8:1 if I remember correctly. With that said, the 347 hasn't pinged at all but the 302 would ping often when running pump gas. The only other thing that changed besides the longer stroke and bigger bore is that the cam went from a 110 LSA to a 114.
|