I just got a 28 building a 540 shooting for 650 hp wondering if anyone can point me in the right direction for a prop

28" Bravo will be very close. Somewhat depends on the rpms you plan to spin it to.
I spun a 26 Bravo to 5200 ish rpms with 550hp in my 28 Pantera.

Of course. I was planning on running the rpms right around 5200

we run a 540 and spin it up with a 26 we even tested a 21 4 blade and would it to over 7000..... rpm is your freind torque at low rpm is a drive killer have fun

really? I figured lower rpm would help me save the drive

No.

Torque applied kills drives.

The more load, the mire torque needed.



Taller the prop, the more load and the more torque you need to use to plane boat which is near where gas motors make most torque.

what outdrive should I upgrade to if I decided too

What drive do you have now?

[QUOTE=Craney;4747876]What drive do you have now?[/QUOTE
bravo 1

Morgan's 2007 28 had a 540 that dyno at 665 hp He ran a Bblades labbed 26 bravo to 80-82 mph 5900-6000 rpms
Good AFR heads and Long tube headers