I'm running Merc 4 blade props on my 357 SR-1. Guy I bought it from said it runs much better w/ the 4 blade than it did with a 3 blade. I'm rebuilding my 502 mpi's to about 500 h.p. and so will need to go up in pitch. I'm wondering if I should be thinking about a 3 blade or stick with a 4? Any recommendations appreciated-

spinning mirage 21 3 blades on mine...

What kind of speeds are you guys doing with these boats,and rotation on your props in or out.

I was barely breaking 60 w/ 502's/ 415 hp (21P 4- blade props.) Don't know what the rebuilds to 500 hp will yield. Props rotate out, if I recall correctly-

tweaked up 454-420 at 480hp = 63-64 gps at 5400 rpm...

I am assuming still a TRS boat, with 500 hp and that boat I am going to say 23P Mirage Plus's, the TRS are deep and will do betetr with 3 blades, cruise will be better with 4 blades, not top end. even with 500 hp I am going to bet 65 MPH max.

Yes, it's a TRS. I'll start w/ 23P Mirage then and go from there. By the way, what's the difference between Mirage and Mirage plus?

Dfference is that the plus has more cup to help bring that big bow up, I run 23P Mirage on mine, bow stays down no matter how I trim it, I am going to a plus in the spring, I was turning 5100 at 65MPH