G's are the race cams fitted to the hot 888's. 431's are a slightly milder inlet cam. I'll be fitting these to a 996 (that's in my 888) at the mo. looking for an 1994 corse 888 styleee but in a 996 guise. Alan (AJR) tells me it should be a ball to ride (with the Ti rod, balenced bottome end, Cossy, high comp pistons etc, etc....) Rgds, Rob |