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    Replacement Engine not Performing

    My former mechanic replaced my 1979 Mercruiser 228 (305 GM, 4bbl) with a 305cu in Grooms Marine rebuild. The Mercruiser 228 with an Alpha 1 Drive and 14x19 stainless prop on my 20' Mark Twain did the following: 2600rpm = 26MPH 3000rpm = 30MPH 4400rmp = 48MPH WOT Trimmed The Grooms engine with...
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