I Have a 16-42 south fork tunnel with same motor and carbs I run a SWC4 power tech 12 pitch and run about 35 but this prop is built for the marsh not speed it comes with cup from the factory. I also have a SCB3 powertech in 13 pitch with heavy cup it runs about 38 but it does not have near the hole shot the 4 blade has and weight in the boat affects it a lot more than the 4. If it had less cup u could prolly get close to 40 but would have blow out problems taking off and turning, not to mention what tunnels are designed for, taking off in the mud.
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