Your not looking to change Diam. of prop, just the pitch........is it stainless or aluminium?? If aluminum, throw it away............The cav. plate should be right at the bottom of hull(not the case w. tunnel hull). If it's lower than that, you will have alot more drag. W/ boat EMPTY(just you in it to drive and maybe 5 gallons of gas) you should be just under rev limit at WOT and trimed out...............That's how to test it.........That way when boat is full of gear and people, the rev's will be right where they're supposed to be at WOT.................that help??
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