Does anybody know if a TO 20 cylinder head will fit a TO 30? From what I have been able to find out, the Z120, and the Z129 engine block are the same other then the Z120 is a 3 3\16 bore and the Z129 is a 3 1\4 bore. This should not matter since you can buy the 3 3\8 piston and sleeve kit for the Z129. Also the head, intake\exhaust, and valve cover gaskets are the same for both engine's, leading me to believe that the TO 20 head will bolt right on to the TO 30. The intake valves and springs on both heads are the same size (Part number) the exhaust valves on the TO 20 are a little smaller valves, but shouldn't really effect performance that much. I would really like to know if anybody has tried this yet. Thanks