I'm currently running a stainless prop on my 1994 Donzi 16 with 4.3 Alpha 1. Not sure on exact model of the prop. Here is what is printed on it:

48-16320 A4 23P A

At WOT it spins up to 5400 rpm (which seems a bit too high-approx. 50mph - gps). I checked the tach. to be sure it's set to 6cyl (it is).

I've heard that a Turbo 1 14 1/4 x 23 is a great prop. for the 4.3 16 ft. donzi. A local dealer mentioed a Merc. Rev. 4, but didn't have a suggestion on size. Any thoughts? I don't want to spend a ton on a prop that might not run any better than I already have.

I'm not only trying to lower the rpm's but would love to cut back on porpoising (especially with a few people in the boat between 20-30 mph) and torque steer. The boat does not currently have tabs, and I would like to avoid if possible, especially if a new prop will help cut down on the porpoise issue.

All suggestions are welcome. Thanks in advance!