There is some bad information on the web regarding the conversion of VG30 block to the VG33. While they do look identical in many aspects, it is not possible to bore a 3.0 liter block to 3.3 liters. I was going to do this on a Z31 I'm rebuiliding and looked into this. The way to do this upgrade (?) is to get a 3.3 L block and build from there.