I have a 500hp 12.7l Series 60 in our RV with 190,000 miles. Great reputation (1 million miles) in over the road service. The 14l would be rated around 550hp over the road. 825hp is a typical pleasure craft only rating driven by marketing. I'd stay under 500hp at cruise (1950 rpm) and you'll be fine assuming you can hit WOT rpms (2350).
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