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Old 06-12-2019, 12:35 PM
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This piece, bolts into that cavity behind the rear main cap on the block and holds that 1-piece rear main seal. Can't put the engine together without it. It is missing in your block pics.

Price has come down a bit, was over $100. 1-piece rear main seal retainer.

They also make these as adapters, to put a 2-piece seal crank in a 1-piece seal block.
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