I forgot to mention; from the top of the transom to the bottom of the tunnel, the height (was) on my boat 24"-that's what it needs to run free- no drag from the gearcase.For TOP speed- about 24-25" pitch prop. in those days a DAH reworked OMC race prop was about the fastest.In fact- we liked to use the large diameter prop OMC made for the 135 h.p. V-4.
(same spline as the 3 cylinder)
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