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  1. R

    Runs great on muffs but not in lake

    Mercruiser 3.0 that I bought as a project. I rebuilt the engine and have it running great in the driveway on the hose with the muffs on however when I get to the lake and put it in the water it stumbles and dies and will not start back up. Timing is set at the sticker on the valve cover which...
  2. R

    Newer 3.0L in place of an Older 3.0 QUESTIONS

    I have a project boat that is a 79 and has the 2 piece seal 3.0l 140hp engine. The engine has some cylinder wear and thought I would be able to get away with a set of pistons but noticed its bore is 4.040 and it looks like the service limit is 4.050 and I wont be able to bore it to 4.060 i guess...
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