Re: Stroking an HP500 to a 540.
 

Would Jim get to pick the color of the duct tape since his boat is red,white and blue or is it just a standard grey on all of JC's engines :evilb: . :D

Re: Stroking an HP500 to a 540.
 

I know enough to be dangerous but I am by no means a gear head. Understand how an engine runs but wouldn't trust myself to rebuild a weedeater. I only know of one engine builder in my area and he's not all about marine. He's all about drag racing and that's not what I want.

Re: Stroking an HP500 to a 540.
 

And BTW... I appreciate this board for all the knowledge it shares... it always gives me a 360 degree perspective on what is happening. Keep it coming guys. Peon's like me depend on you for motor wisdom!

Re: Stroking an HP500 to a 540.
 

Hey Jim,

700hp w/ those heads is not obtainable unless you use a very aggressive solid roller cam. You will need at least a 310 dart or afr, probably 325's. You can get at least 600hp out of just 510's w/ hydraulic roller camshaft and would be able to use your parts (less the pistons & camshafts.) Consult a professional builer for your needs. FREE is not the answer. Spend the money ONCE. We have all had the "friend deal before". It NEVER works out in the end. You are going to at least need heads, cams, pistons, rods and carbs to make 700hp. Hope everything works out for you, welcome to the boating world, the HARD way. Whippled it you cheap bastard. I know a whipple dealer on smith mountain, just kidding.

Re: Stroking an HP500 to a 540.
 

Ran the 741 cam on a blown HP465 502 motor for a few yrs with no problem of reversion. Standard Merc/Gil exhaust with silent choice.

Re: Stroking an HP500 to a 540.
 

Sell the 502's build two tall deck 540 motors and their will be no question of thier reliability.
The Tall deck blocks will out live the short deck ones and be money better spent . While at it build 555's with the 3/8 stroke cranks. The parts will all cost the same, except for the blocks, and hopefully you buy the Darts, for a litle more and have some really great tough motors, It's worth it in the long run.