I have a 22' cuddy 260/5.7 Alpha One with a 14x19 prop. I'm looking for a little more top speed, not sure how much a difference is between sizes. I can't give an accurate current speed, but I'm guessing it's right around 48-50. I got a GPS reading a while back at WOT at 43 but that was with 2 dead cylinders (long story). Anyway, engine rpm is 4600. I can overrev a little more but I throttle back to 45-4600 normally. Engine runs strong, gets on plane quick.