I have a 1986 V-20 Fisherman. It was originally equipped with an OMC Seadrive. A previous owner removed the powerhead and lower unit but retained the bracket and tilting mechanism. A tapered wedge was then fabricated out of what appears to be marine grade plywood & fiberglass. This serves as the mounting plate for a 2003 Johnson 115 HP 4 Stroke. the best I can figure the anti ventilation plate is 2-3 inches above the keel. My WOT is about 5700 rpm and max speed is 31-32 MPH by GPS. The only markings on the prop look to be 21R. I measured the dia. at 13". Any ideas on how to increase top end and have a cruising speed around 30 MPH would be a big help. As a side note this fall I am removing the OMC stuff and will be installing an aluminum bracket that will move the motor back about 4 inches and maintaining the 2-3 inches above the keel.
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