Will, for what it's worth, I have a 1982 BW 15 Sport, refurbed and repowered in '05 with an '05 Yam. F60. Factory Yam. SWS (supposedly SS but black powdercoated). At 10.25 X 15, I was constantly bouncing off the rev. limitor due to the manual jack plate I also intalled. 61-6200 rev.s depending on wind and current.
After much research on the Whaler forum, I purchased a Hot Shot Turbo 10.5 X 16, which, I am told, usually runs more like a 17. The overall weight, size and thickness of new prop is significantly larger/heavier.
What I found was worlds of difference. Factory prop was light with thinner blades, wound up quickly, and made the boat quick, light and nimble, if you will.
New prop almost literal translation. Heavier, more stable, and longer to wind up. Example, slightest wake at full throttle, would initiate violent chinewalking ( on the edge before any hint of wind or wake). Back off throttle while trimming back down in anticipation, and was not that delayed. (With factory prop).
New prop brought down chinewalking, delayed response of throttle and trim, but more solid transition of wakes, then dumping throttle, trimming back out was delayed considerably and took longer to wind rpm's back up.
Bottom line? Still turning 46-47 mph, but revs no higher than 5800. Still trying to pick up speed without rev's.
If you want, try
www.thehulltruth.com. PeterB is working with same guy I use over at
www.continuouswave.com, Tom W Clark. A wealth of knowledge, can get almost any prop you want to try, and sells them cheaper than ebay. He lurks all prop questions, just does not own a classic SeaCraft...
Hope this helps. Part II.