i have a 30 ' scarab panther with a single 598 with about 750 hp with a bravo i am turning a 22 p four blade 5600 rpm do you think it would kill my mph if i went to a 24p or 26 p what do you'll think i am runing 79 mph on gps

you might get more answers if you post in the prop talk forum.

What rpm was the engine designed to run at WOT??????

Every 2" of pitch will cost you about 400rpms.

What gears?

they are 1:36 gears i was told i can turn the motor up to 6000 and stay in my powerband but i not sure how long a bravo will hold up thats why want to change props

Do you have a Dyno on the motor? You need to stay in the power band and should run at least 1000 RPM more than the RPM at which your peak torque...this is what will kill your drive...running to close to your peak torque. If you step up to a 24P you will loose 400 RPM and 800 ish if you went to a 26P. You really need to run at the RPM close to your peak HP .