I just purchase a 1999 30' Spectre with 509's putting out around 540hp. The boat has Dominator 4500 series(#8896) 1050cfm 3 circuit carbs which I have come to find out probably are not the right carbs for my application(Unless I want to go broke on fuel and plugs). I guess they are design to run idle to wide open. Very rich in between

Does anyone have experience with these carbs? Anyone know a way to make them work? The guy at Holley said if I get them to run good at midrange they will be lean at wide open.

What would be a good carb for my application?

Anyone know of a good website to trade carbs?

Probably 830 or 850 jetted to your motor. HP 500's use a 800

I have a 502ci with 547 hp and i run an 830cfm holly carb with 98 jets, i will check the air bleed size and get back to you.........

Thanks!

What is the Holley part# on your carbs? Are they mechanical or vaccum secondaries? Which is better for boats?

I found someone that will trade me for a pair of rebuilt Holley 850 (#4781) Double pumpers. Any thoughts on that carb?

Is there any benefit in trying to find the actual Holley MARINE carbs?


Dave

Holley HP830cfm or maybe some HP950cfms will probably be the best. Mechanical secondaries work best on boats. Both come in marine versions.

You should definately use MARINE carbs. Its a safety factor. They are set up with J-tubes and different shaft seals so they won't leak any fuel externally.

Try this web sight. He is one of the best!http://www.nickersonperformance.com/