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  1. E

    Choosing a prop

    My boat has a 4cyl, 3.0 Liter, 1988 GM block engine with an OMC cobra outdrive. I cuurently have a 13 3/4 x 15 prop and I am running at approx. 4300 rmp @ WOT at a speed of 32 mph. I am not sure of the engins HP. I was told probably 125hp. Is this right or should I go up in pitch. What do you...
  2. E

    Choosing a prop.

    My boat has a 4cyl, 3.0 Liter, 1988 GM block engine with an OMC cobra outdrive. I cuurently have a 13 3/4 x 15 prop and I am running at approx. 4300 rmp @ WOT at a speed of 32 mph. I am not sure of the engins HP. I was told probably 125hp. Is this right or should I go up in pitch. What do you...
  3. E

    Engine Information Needed

    I am new to the boating scene. I have inharited a 18' 1989 Thompson I/O boat. The engine, 4cyl., 3 Liter, has OMC stamped on it but there is a Mercury Marine tag on it. This tag has a number on it, 3770835. A closer look at the engin block has Model No. 302AMRGDP and Serial No. T1038268 on it...
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