Michael, I think the Viper prop would be a good test because 3B props typically don't grip the water as well as 4B props. If it runs ok with the Viper with AV plate at 1.5" above keel, you can be pretty confident that it will be fine with a 4B prop! Capt. Terry has run his old Merc 3B prop that I believe had a tendency to slip a bit although it gave him good rpm and speed, but he's run several different 4B props that all seemed to grip the water ok, although he couldn't turn them fast enough. He may have even tested a Viper initially. Denny
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