Whipple!! :riding:

His engine was rebuilt and dynoed at Precision Power Offshore before I started this thread and actually makes a little more then stock HP. That's why we are even more surprised. I just did not want to confuse the thread with that info. Main goal is to at least see what he should run stock.

My friend thinks the boat came from the factory with a 26" bravo prop.

I've asked him to measure his propshaft height does anyone else have their measurement?

His 24" bravo does not gain any speed from 4800-5200rpm, trim just changes rpm.

He's going to try a stock 26 this summer then maybe lab it.

Any other info is appreciated.

When I bought my boat it had a 22 pitch bravo one and the best speed I ever saw was 63.5 at 5150 and cruise speed was lacking severely. That prop was bent all too hell by an underwater log, so I found a labbed 26 bravo that I put on and cruise speed came up significantly, at wot I was able to get up to 66.2 but could only spin the prop to 4700-4800 rpms. From my experience these boats do not like much trim at all, like Verbi said it will feel like the boat is freeing up but if you watch the speedo you will actually be slowing down. Although I have never measured, the 280 has a pretty high x-dimension and respond very well to a 1" spacer to get the prop into some cleaner water. Good luck with the boat and keep us updated to the results.

502's are meant to run with 5-blades not 4-blades, give me your exact specs, and I'll fit you a new Hydromotive P5X, get a stock prop and I'll lab it for a fraction of the cost, they make pitch in every inch, what is the exact HP, whipples are nothing but a waste, head/cam package with 10:01 pistons is the way to go, I had this done to a 525 EFI on a 27 Fever, 655 HP plus 10:01 pistons, I run a Hydromotive 27 Pitch P5X with a 1.35 gear, run 95-97 MPH with a light load all day long.