Can you tell if a block has 1 or 2 piece rear seal without opening it up???

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Grit dog

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I believe I just learned (buddy assembling up a 400sb he just had built) that the thick front main gasket is only ‘77? and older engines.
If that helps.
 

bucket

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I believe I just learned (buddy assembling up a 400sb he just had built) that the thick front main gasket is only ‘77? and older engines.
If that helps.

I thought it was '74 and older.
 

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