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Actually... 140-160

OKies, I'm going to enter the data into my SWAG calculator.
I am going to use:
3.530" as the bore.
0.028" as the installed head gasket thickness.
3.340" as the thickness of a B20E head, since that's what my small collection is + that's what my '72 green book says + that's what the online '73 green book says,
3.280" as the thickness of your head & finally
66.666% of the bore as a SWAG on combustion chamber cross section area.

My calculator says 11.95:1 compression!

My advice would be to bolt the head on with an old gasket & measure the head to piston gap with some clay or solder.






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