ISO cylinder head for TO20

I believe the TO-30 head will also bolt up. The difference being larger valves in the head.
It appears your now the second person looking for a TO-20 head.
 
Combustion chamber is smaller on TO30 I think.
https://forums.yesterdaystractors.com/viewtopic.php?p=7273448&highlight=z120z129+cylinder+head+debate#7273448
 
It looks like a Z129 head would work on my Z120 and would raise the compression ratio. Is there a downside? Sounds like a good thing to me. I will be converting to 12v, so cranking shouldn't be a problem. Maybe it would run hotter?
 
If a TO30 (Z129) head would work (with higher compression) that might be an option. What about a Z134 head from a TO35? Those a re far more common.
 

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