Z22 Block (1981-82 Datsun 720) fitted with U67 Head (L20B 1978-79 Datsun 620)
Many people discuss what head gasket to use for this combination.
Simple we recommend you to use head gasket for Z22. 10-J7T-203,
Here is how you modify it.
Now, do not try to cut and connect head gaskets! We have read people's comments on "connecting" head gasket for Z22 and U67. They will NOT last! Period.
When you fit this head gasket 10-J7T-203, please apply engine gasket maker silicon to fill the area that 720 had gasket does not cover U67 head side. Do not try to shave off the area where timing chain turns around. It is close, however it would not interfere.