I think it'll be too big. I have measured them in the past but think that was on the PSD forum. After a quick google it's saying the G40 is 50mm inlet, G60 is 90mm inlet. Although if you port it then obviously it's bigger. The MaxRPM site says 90mm is the largest you can fit to a G60.
I thought the 40 and 60 referred to the scroll size or something.......