I bought an 87 Donzi Z25 with an Alpha drive and a 454 mag. Is this an Alpha SS or some other version of the Alpha?

looks like it has some sort of hydrofoil connected to the cavitation plate...

It does.

It's a Cobra Edge Pro Planing and Stabilizer Plate.

That is indeed an SS drive. Rough sand cast finish on the upper is a good givaway along with the CLE lower. The hydrofoil was probably to help the big boat plane with the short drives takeoff leverage (lack there of).

Do you want to sell it. JOHN

their was one on speedwake a whyle back,dont know if its still available..their was a few on donzi.net also..

http://www.speedwake.com/newclassifi...p?product=1946

I am looking at a bravo 1 setup right now. If I can get it at the bravo at the right price I would want to sell it.

This drive has been great. No wave hopping or hard hole shots. I respect the torque of a BBC and know that it is my weak link. The Cobra Edge Pro Planing and Stabilizer Plate gets the boat on plane quickly but it does cause some drag. A bravo 1 would be a better fit.

If you plan on getting anywhere near the speed with the ss drive you will want to look into a imco -2'' lower under the bravo upper..If you stay stock bravo then you will loose around 5 mph on the big end..