I have seen before that if you put a straight edge on the very bottom of your hull and extend it out to the cav plate on the motor you can determine if your motor height is correct.
I think the formula used is for every 12 inches the front of the motor is away from the transom, move the cav plate up one inch from level with the bottom.
Of course you have to get the hull bottom level and the motor straight up and down for this.
I have mine mounted with the cav plate even with the hull bottom, a little low, but it never breaks the prop loose no matter what.
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Sold - 1984 V-20 Cuddy with a 2003 Johnson 140 hp gas sippin 4-stroke.
1995 Ranger 250C with a 2015 Suzuki 300 hp 4-stroke.
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