The 4.3 V6 will require different motor mounts than the 3.0, so the boat will need some modification to make it work. Just something to think about.
The current 3.0s are 140hp, the 4.3 MPI is 220hp. The 3.0 should be plenty for a 20, but a 4.3 will really make her scoot if that's what you want.
Dave
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Blue Heron Boat Works
Reinventing the wheel, one spoke at a time.
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