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I would get shot or hung for letting this one out of the bag but most of the involved party is dead and gone or about out of the game. A close Friend worked for one of the really big Ford teams and they were taught to flip a head over and chamfer the head bolt holes on the deck surface of the head. They found out that as the head was being torqued down it was pulling the head harder under the head bolts and distorting the head mating surface. Putting a chamfer on the head bolt hole spread the pressure evenly across the deck.

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