Re: speed
I own a 1979, 23' seavette, with twin Evinrude 200 Hp, long shafts, non counter-rotating. Mtrs were rebuilt in '86. They are tired but run well.
Props are SS, 13 3/4 x 21. Has a bracket. Tops out at about 5400 rpm. GPS says I am doing 56 mph with about 70 gallons in the tank (1/2 full) and two people. Sales brochure says that with a single 235 Hp, (no brackets back then) boat did 43 mph. Sounds about right for your test. Hope this info helps.
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