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Message: <blockquote data-quote="airshot" data-source="post: 505518" data-attributes="member: 1183"><p>That 15" is not an exact number, I have saw from 14" to 16" depending on how it is measured. Most transoms are on an angle, but the proper measurement should  be true vertical, not measured on the angle. Way back then it was considered the cav plate was supposed to be an inch or two below the keel/ bottom of the boat.  Today we have rethought this and find we get better performance if the cav plate is right at the bottom and we also have props designed to run closer to the surface of the water than what we had many years back.  On small outboards these are not considered performance motors so the depth of the cav olate is not as critical.  Tolerances do and will vary.  On serious performance boats/ motors they have adjustable mounts to fine tune that height for optimal performance.</p></blockquote><p></p>