Thread: Crankshaft rear main oil seal grooves
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Old 03-20-2004, 06:56 AM
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Location: Fairfield, CT
Cobra Make, Engine: HM-2027 / 427 SO
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Yes they do. And as 427 s/o stated this directs the oil back to the engine. I've seen some run the rev marine cranks with the grooves smoothed but it can leak a little. So it's what you can live with I guess. G.
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