Thread:

More speed

If some of this makes no sence, don't worry about it. Just answer what you can.

What RPM does it spin at Wide Open Throttle, right now, as it is?
What are the propeller dimensions? (diameter x pitch)
How many blades does the propeller have?
What v-drive is in the boat?
What gears are in the v-drive?
Is there a transmission? (fwd/nut/rev) If so, what type?

What cam is in it? Brand & Part# or cam card specs are good.
Cam... Solid/Hydraulic/Flat tappet/Roller?
Intake? Tunnel ram, single plane, dual plane, supercharger...
What carburetor(s)... or fuel injection
What cylinder heads? Aftermarket or GM casting# please.
Heads... stock or ported?
Cylinder heads Iron or Aluminum?
2 or 4 bolt block?
Cast or forged crankshaft?
Connecting rods?.. Stock GM or aftermarket... brand/type?
Pistons? Cast/Forged/Hyperutectic
Compression ratio?

Where do you get the figure of 500hp?
Was it run and tuned on a dyno?
Is there a dyno sheet you can post?

The more info we can get, the more accurate we can be in aiming you down the correct path. And you'll spend less time and money getting where you want to be.

Good luck,
-Seth-

It very well could be the prop, so don't go cutting or changing anything yet... We at least need the prop info and comparitive rpms from old engine to new engine.

Originally Posted by Mark 73

Im in new mexico, my brother built the boat and moved to texas and left it her to rotte away so I wanted to finish it , ill try the gears , thanks I didnt no were to start

What part of NM are you in. I'm in the Albq. area and would be glad to help