I have a 1991 251 GTX 454 BB 68 on GPS @ 5200. Spinning a mirage 24 cup was added. I'm looking for prop information, alot of guys are spinning 4-blade hydromtive will this will with chin walk. I need more speed. Like we all do. I think I will try talking to some one there about a 22 or 24 4-blade can you try before you buy.

I've got a 90 251 gtx that i just put a 502 in (see under "motor mounts")
I've got a 25" mirage on it now and it's only spinning at 46-4700 @ 68 on speedo.
I'm in the same boat as you. Havn't really got a strait answer.
I'm going to call Hydromotive when I get a chance and see what the suggest.
Going to try a Bravo 1 this weekend. My dealer let's you demo for free. Going to try a 23" and a 24"
Will let you know how it go's.

I did run an 88 251, 513ci Gen V, 690hp, ran 90mph with 27 Mirage, 5975rpm. Most of the time I did run a 25 Mirage, could turn it 6300rpm.

New boat, still a work in progress.. 283 Convincer 99'. 565" 400hp?? Imco stand off box, 26 Bravo labbed, one run so far at 80.1 on the gps. Only need 11mph to catch my buddy's best speed from last year in his 283...

Check300,
How does that hull handle that tripple digit?? Glad to hear you got it dialed in.. Hope to see you out there soon!! I wont be able to catch you .. so would you please throttle back and let me catch up!!

Dick

I have a 1994 253 with a built hp 500 that has about 650hp. @ 5500 rpm. the boat will run 80 on gps give or take depending on water conditions

Anyone know what speed you could expect from a 1998 Convinsor with a HP 500 in it? Is this the exact same boat as the current Convinsor 300?

Thanks
Brian

I had 1996 242 Convincor with Joey Griffin built 540. On 14lbs of boost (VP C17 gas) I ran a top speed of 110.1 mph on GPS, spinning Spinelli 14.5x31 at 6,000. Every day speed was 101.3mph on 10lbs of boost, spinning Mach 15x29 Patriot prop at 5,800rpm. Best part, boat was as stable at 110.1 as it was at 80.

Checkmate 110, what drive where you running ? And what was your HP ? Sounds like an hell of a ride. I have a new 572(NA) I am getting ready to drop into my 251.

I was running a Bravo I drive with all IMCo inside (1:36). The motor dyno'd at 794hp@6000 and 833flbs@5,400. That was on 10 pounds of boost and no NOS. To the best of my guesstimaion on 15lbs the motor was probably putting out between 1,000 to 1,100hp and then I had a 250hp NOS kit for good measure. With 150hp NOS and pump gas (10lbs of boost) the boat ran 101mph. The boat was a lot of fun.

A better pic by Tom Newby of Powerboat Mag:

New here. My 1992 Enforcer 230 ran 71 on the speedo with the stock 7.4L Bravo One turning a 25 Mirage. That is until last week when the head gasket blew at 515 Hrs. Upgrade fever has me considering upgrading to a new 496 HO or a 502 MPI crate engine at this point. Hopefully be back on the Potomac river by end of July.