I raised mine on my other wise original 74 20SF to 26 and a quarter. I have a 94 Rude 150 mounted through 2nd hole from the top and occasionally I get a little cavitation compared to the previous setup of same engine same boat with the 20-inch transom and a 5 inch static Jack Plate ratcheted all the way up. Although the cavitation is extremely nominal, I do get it occasionally. I believe when it happens that I am in fact trimmed all the way down but I also have trim tabs on the boat since I raised the transom.
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