If you are asking if the bore diameter of the head gasket can be larger than the cylinder bore in the block, I would say it almost has to be larger, as there is some slop in the fitment of the HG on the block deck. We wouldn't want the inner edge of the HG fire ring to interfere with the piston protrusion over the top of the deck.
That's my common sense answer, sorry no exact numbers.
Hopefully someone else with more definitive answer will chime in.
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1985 744 gle d24t
1985 745 gle d24t
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