Re: 23' inboard cruise speeds?
Deepsushi, I also have a 1976 inboard. Mine is powered by a Marine Power 350/260hp EFI. I'm turning a 16 x 15 prop with a slight cup.
3400 RPM gets me 20 -23 knots and that seems to be the sweet spot.
It tops out at 30 knots around 4300RPM.
Your numbers are pretty impressive. You may want to check your top end RPM, tach & speedo- Are those gps speeds?
Good luck with your inboard-It's a great ride.
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