John Deere 40 Cylinder Head Interchange

1946JDA

Member
Does anyone know for sure if the head from a John Deere MT will interchange with the head from a John Deere 40S?
Thanks in advance.
 
compression ration of an M is 6:1
Compression ratio of a 40 is 6.5:1

But I think either head would bolt onto either block.
 

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