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    Mercruiser 4.3L Thunderbolt 5 engine age

    Good evening, i own a 22 ft Grady White Tournament and the 3.7L just went, like knock,knock,knock....... still starts easily but the knock is a harbinger of doom we limped it off carefully. but its 34 years old. IF i could get a rebuild kit its still min 3k to have it rebuilt. so, my question to...
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