I`m running a 105 Chrysler on a Desilva F runabout. As it is now the propshaft is 3/4" below the bottom. Prop is a 2 blade Johnson mfg. brass 9X18-20 cupped. Its very difficult to get on plane, and turns about 6100rpm at 62mph. I`m thinking it needs to come up 3/4" inch to 1 1/2" above the bottom. With the 250lb. chrysler the boat is stern heavy but runs flat with engine at verticle.
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