Re: bracket on a 1978 23'
Check out the Potter/Hermco bracket - all glass, most flotation of any bracket out there, so will help maintain static trim and self-bailing capability. I believe the consensus is that a bracket will add 2-3 mph because shifting weight aft makes it easier to trim bow up, reducing wetted surface area. Don Herman can probably explain it better. May also reduce drag by allowing you to raise motor. Cavitation plate on mine is ~4.5" above keel with 30" setback. Boat will run almost 50 w/150 E-Tec.
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