IF I were creating an engine package for a new boat , I would select the tranny from a landing craft.
Two engines are bolted to it with a single output , so the shaft would still be protected by the keel
Either or both can operate together.
(2) 3-71 would be my first choice as they could be canabalized to keep one running , with only 20,000 to 30,000 hours of service life , this wont be an early hassle.
A 3-71 and 6-71 could be chosen with great commonality in parts.
A CPP would add to the boats abilities , for about $10-$14K extra.
A hatch over the engine and in the cabin top as built in , would make any engine swop an overnight job. Use your flopper stopper mast to lift.
If sadly the air police were involved a 80-100HP engine could be used on one side , and a good sized noisemaker with an added reduction gear (if no CPP) would make a great working get home package..
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