Stop in for a cup of coffee

Mattax said

I always forget, but I think 'J' (U,O) head castings were used during the last two high compression years.

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@toolmanmike
I found it, Brian6pk and Jahrhibi and others have said 70-71 2.02 valve heads are usually 915s, so no X of course. J U O maybe I
I remember looking because the engine I bought a couple years ago has 915s 2.02s. Of course the one I bought was opened up, so that's not a good example of evidence.