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Bill I thought about it but when you look the cavitation plate it is already at 1" above (at least mine is) bottom which is what we are told is the spot.
As our boats (the 150 Montauks) are basically to new we don't need to repower the nice running Merc. 60 HP 4-stroke yet.
If my Mercury ever bites the dust (which I do not see in near future) I like to try a 70HP (Evinrude/Yamaha) and see what she does.
She's slow out of the hole but for me has enough top speed with the standard 60HP
I played around with 4-bladed merc props which give better torque and slightly quicker hole shot but overall the 3 bladed standard SS Vengeance prop that comes with the boat is the right selection. (see my posts elsewhere on this site for that subject).
Love my boat.