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Thanks Ted
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The difference in the FYB rear seal retainers lies in the diameter of the seal surfaces on the crankshafts. The diameter of the crankshaft seal surface on the 239, 256, 272, and 292 is 2.625”. The 312 crankshaft seal surface is 2.750”.
 Lorena, Texas (South of Waco)
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yes.
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Is there a difference between 292 and 312 rear main seal retainer
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