I know zip about newer outboards, but based on my experience with duoprop 1/0s I'd be a little concerned about longevity of a 300 hp outboard. The 27 is a much bigger and heavier boat than mine. I run a 5.7, about 300 hp, fuel injected V8 with a volvo duoprop in a 25 Seafari, an extremely torquey combination. It's perfect with a light to moderate load. When you load it real heavy, the engine is working very hard, easy to exceed the safe vacuum range, which would seriously hurt engine longevity. A very big, low pitch prop would be a good idea.
Anybody know if you can install a vacuum guage on a big outboard, and what readings would be normal?
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