Looking at putting a Tall Deck 650hp in my 24' Outlaw.
Any advice on prop sizes?
What kind of speeds will I see? 80's?
Yes, I will be upgrading the outdrive.

I ran 77 gps in my 24 Outlaw which had around 550 hp. So that being said I recommend you add an extension box and a better drive and you should see around 85-88 once it is totally dialed in.

As for props I would start with a 30" Bravo 1.

I guess propeller sellection would be best decided upon once you figure out what you are going to do outside the boat first.
I'm with smitty on the extension box. I'd slam on a shorttie drive while you are at it.
I'm going to spin 5 blade 30s on 1:36 gears.
Call Brett Anderson @ Bblades. He knows what he is doing. Trained by the best, Dennis Cavanaugh of Mercury Racing.

I was running right up to 650 hp in a warmed (and chilled) 525SC. I was seeing almost 80 with her....Never really had a chance to GPS or radar it.

It was ****IN SCARY FAST!!!

Loved that boat.

I ran a 4 blade 28 pitch on it. Stock bravo with hydrolic steering. Never blew a drive But did blow a motor Sucked a valve...Water in the exhaust. That hurt the check book.

Looks like you had a '97 also. Even have the same color scheme.
We even had the same mechanical problem, a Sucked Valve from water in the exhaust. lol

Our boats were seperated at birth!

It was agreat boat, ran like a raped ape....Liked to chine a "bit" in the upper 70's. Had GIL dry pipes on it too...Loud as a MO-FO!

My 1993 24ol runs about 74 on gps with around 500 hp at the prop. Thats with a labbed 26 bravo 1 at 5250. I got my prop back from julie a couple weeks ago. They let out a little pitch to settle down my chine walking.

There's a guy (cant remember his screen name) on TBM that ran 115 mph in his 24 OL. BIG HP though.

That guy has a hammer or something not an Outlaw. And he's running 1150 hp

I'm turning a 30p bravo worked by Julie. I'm around that HP,running 85mph gps at 5200rpm.

Any problems with Chine walk???
What size tabs are you running?