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with out knowing peak rpm or what prop i would say 18% or 22% with out a 2 speed.
Tony
 

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Have you seen a dyno sheet on this engine too or is it SWAG on the hp? Lots of people have 600 hp engines that dont do close to 600 if you know what I mean. Also do you already own a good prop for this set up? If so what size. Gear changes and prop changes get to be expensive.
 
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