4 bbl to 2bbl holley

[lilmandavis]

will a 2bbl holley be ok for a big block if im not racing someone? what size jets should i use? will i burn up pistons if i run a 2 barrel?

 

[lilmandavis]

Re: 4 bbl to 2bbl holley

will i notice any feul consumption difference? both are marine holleys and the big block is a 460

 

[Don S]

Re: 4 bbl to 2bbl holley

If you have a big block, you need a 4bbl carb. They aren't just for racing.

 

[lilmandavis]

Re: 4 bbl to 2bbl holley

why do the automotive 454's hav a 2 bbl tbi? im askin just for kicks?

 

[paulie0735]

Re: 4 bbl to 2bbl holley

Don’t do it! There are no quick easy fixes for a gas hungry big block, it is what it is. Big, powerful and thirsty! Yes late model auto engines are getting some kind of reasonable gas mileage by running smaller air valves, but they have computer monitoring and EFI to help keep everything in order. <br /><br />You can tune your engine to run on a 2 bbl holley of around 500 cfm but IMO getting it setup correctly and jetted right is gunna cost you more than any fuel cost saving you will see in the next 500 hours of running....... and a big drop in power above 3,000 rpm.

 

[Don S]

Re: 4 bbl to 2bbl holley

why do the automotive 454's hav a 2 bbl tbi? im askin just for kicks?<br />

Because automotive engines don't operate like marine engines do.<br />When was the last time you seen a 454 automotive engine run at full load, in low gear, going up a steep hill at 4500 rpm all day long.

 

[lilmandavis]

Re: 4 bbl to 2bbl holley

i have a 2bbl manifold as well as a 2bbl 500 and jet kit for hollys got it all for free from some old salt i might see 3200 rpms to plane out but i get like 5 yards per gallon !!!! and even if i fill it up with my caddy.....well 300 gallons at these prices today and.... i want diesel. thats what i want but as for now im interested in this stuff i have sitting on the bench ya know. just throwin round ideas. i like to research stuff before i do anything extreme. pays to be safe ive found. well cheaper anyway.....

 

[lilmandavis]

Re: 4 bbl to 2bbl holley

very true don. i dont ever question you i just pick your intensly educated brain

 

[lilmandavis]

Re: 4 bbl to 2bbl holley

well actully we used to climb lots of hills back home......oppps wrong forum. lol your goin to ban me arent you !!

 

[ramster]

Re: 4 bbl to 2bbl holley

A four barrel can actually get better economy, especially if it is a spread bore type like a Q-jet, or an edelbrock/weber. The spread bore carbs have smaller primary openings than a two barrel, and if it is a vacum operated secondary, it only opens up at full throttle or heavy loads. Make sure you have yours jetted properly, and if it is a mechanical secondary you might want to switch to a vacum type.

 

[Bondo]

Re: 4 bbl to 2bbl holley

especially if it is a spread bore type like a Q-jet, or an edelbrock/weber.

The Merc./Weber/Edlebrock/ Carter Clones are only spread-bore in the 625cfm Carb......<br /><br />The 750cfm is a standard Square-bore..........<br /><br />Not that it Matters,...... Boats Burn Massive Quantities of Fuel,.....Regardless.....