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    Question - 4.3 truck marine block swap - goes 4000rpm on muffs, only 1200rpm in water

    I have a project I am stumped on and hoping someone might be willing to offer constructive advice. QUESTION: Why might a motor run up to 4000rpms on water muffs but only climb to 1200rpms when put in the water. Net result is a boat that goes 10mph. Short story is we purchased a 1996 Rinker...
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