I have a twin engine 89 Baja Sport 280, Brovo drives, 1.5 ratio. Boat ran 68 (GPS) with 'tired HP 400s, 5000 RPM, stock 23p mirage plus props turning in. Boat is listed as 6850 lbs dry, likely weighs 7400 with light load of fuel and two people.

I just finished rebuild of 1997 Generation VI 502s, to original specs, 540 horsepower injected Lingenfelters.

I installed Dart single plane intakes and 800 cfm holleys setup the same as HP500 mercs. I have EMI manifolds with stainless steel tails.

I assume about 500 horse power at the props, maybe a little more or less.

Looking for prop ideas.

Thanks

If your hitting 500hp I'm guessing 28p Bravo's

I'm with Irish. 28 or 26 Bravo 1's will be a good choice, but with a deep x-dimension like that boat has you may be better off with a 25 or 27 Mirage Plus.
Either way, call Brett @ Bblades (http://www.bblades.com/) he has a propeller loaner program. It's a try before you buy deal & is very affordable.
Brett will know what will be the best fit for your boat.

Thanks for the information.

I have an 89 280 Sport and found that the Mirage+ works the best due to the low X as Mr. Smith noted. I had them labbed by bblades. Brett does great work and is familiar with the old Baja's. With your power, you should have no problem turning 25's or even some labbed 27's, but I'm not sure where you want your RPM's to be. The 4 blades worked okay, but held the top end down a little. I could never cavitate a 3 blade. Be VERY careful with that hull. Mine takes on a behavior of it's own at anything over 90. Filling the hook and running the steering to the helm helped very little. You will get a lot of practice at steering through chinewalk. I don't think they were designed to go much over 70. I always wanted to try some shorty drives to see what effect it would have on the handling, but it's just too much money to spend right now.