dozer

I recently purchased a pair of fresh 496's 600 hp. They have750 holleys, I am thinking they are a bit small. Anyone have any thoughts on this ??

wannabe

At 600 Hp and 496 cu inch you are probably at the limit of those 750's. I would think an engine like these would have an 800 cfm or even an 850 cfm. Did you buy these engines new? What did the engine builder say?

Wannabe

dozer

I bought them used. I was told they were 600hp. They are going on the dyno this week to see if they are what I paid for,I have negitive feeling about the whole thing. I just think 750's are a bit small, unless they are not 600 hp.

ROTAX454

Your intake system along with the C.I. will dictate the carb size and set-up (annular or downleg) . Great suggestion on talking to the builder. If a homebrew build, then contact an induction specialist like Wilson Manifold. Wilson can transform that intake manifold from the automotive to marine performance world.

wannabe

For poops and giggles I went to the Holley website and ran through the carburaetor choice program plugged in 6000 rpm, 496 ubes, and moderate build-marine. Came back 850 cfm.

I was bored this morning.

Wannabe

MOP

Plug in 5000 not 6000 RPM which is where your drive will survive, many a warmed over 502 have 750's. We run more on torque than HP, to much carb will hurt normal operating ranges. 600 HP 496 pray it has good internals, stock bottoms were not that good for high HP applications.