cruise speed for 3208 cats at 210 h.p.
I realize this thread is rather old, but in the interest of those who are still wondering, here is my input.
I have 3208 Cats 210 h.p. in my OA 423 Classico. At 2000 rpm, I get a flat 10 knots. I suspect the increased fuel usage at 2250 would not justify a tad more speed. I understand that the 300 plus h.p. engines will give you 14 knots in this same model boat but I have no personal experience with them.