I have a Df140 on a 20 foot Seacraft. I'm using a Suzuki SS 14 X 20 three blade and it will turn up to 6150 with a good load on it. Comes out of the hole easily and holds plane at 13K (no tabs). You don't need a 4 blade prop to offset this 410 Lb engine unless you're wayyyy back on a bracket. You should be very happy with this choice of prop.
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