How many compression rings in marine engines normally have?

How long does it take for rings to seat on a rebuilt 454 marine Mercruiser engine?

  • I had my engines rebuilt and now when I'm running I get an excessive amount of blow by through my valve covers is this normal for a rebuild or do I have other problems

  • Answer:

    I have always had it happen in the first few hours at the most.If you have more then 10 hours you might try the bonamy trick.Look it up. Go to an engine rebuild forum and get better info.

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