Carb question

[patmckinneyracing]

Is there anyway to make a carb either smaller or larger concerning the cfm rating?

An example would be if I had a 750cfm carb, could I downsize it to say a 650? Or take a 600cfm carb and turn it into a 750cfm?

 

[monte olrac]

Not with out buying parts...if you do decide to buy the parts it's cheaper to buy the new carb.

 

[patmckinneyracing]

Thought I'd ask. Lunati recommends a 700cfm carb with my lunati cam and I've got my eddy 600 and carter 750. Didn't know if there was a way to up or downsize carbs without spending major bucks.

 

[JBreu]

Pat,
I say throw them both out and go with a Holley.............Depending on your HP I think a 750 holley 4779 will be just what you are looking for...........Or try the Holley street avenget 670 cfm....All in all I think you would be happier with the Holley...FYI, Carter and Eddy carbs are all one in the same......
Joe

 

[patmckinneyracing]

I know carter and eddies are the same. One is an actual Carter competition afb carb while the other is an edelbrock.

Me personally, I like Eddy and carter a helluva lot better than holley. Just personal preferance. I do have a Barry Grant 750 that would work better than edelbrock or holley. Especially since it has the 4 corner adjustment.

 

[84cutlass454]

no way eddys are junk go with holley nothing runs like a holley go and get a holley double pumper and u will see what i am talking about

 

[JBreu]

I know carter and eddies are the same. One is an actual Carter competition afb carb while the other is an edelbrock.

Me personally, I like Eddy and carter a helluva lot better than holley. Just personal preferance. I do have a Barry Grant 750 that would work better than edelbrock or holley. Especially since it has the 4 corner adjustment.

Problem solved 😀

 

[RITTER]

I have always been an Edelbrock guy but am trying a brand new HOLLEY carburetor on my new build. I hope I won't regret it.

The Carter AFB carburetors are nice carburetors 8)

 

[bjohn07]

well ive only used holleys. but everyone i know who has used a e brock goes back to a holley. the street avenger 670is a good carb. my friend is running that one on his bu. me im a double pumper guy. im gonna use a 750dp i got for 50 bucks off cl. it needed a rebuild which cost me 50bucks in parts. but since u got that bg demon already use that its just like a holley just with some billet parts.

 

[Minion1186]

well actually to a certain extent, yes you could reduce or increase the cfm of a carburetor. Lets say you have a rochester qjet, or a holley 750 dp, you could install leaner jets, different accelerator pumps, secondary metering hanger and rods and basically make it run leaner. Although qjets scondaries flow as much cfm as needed on the engine, so if you have a stock 305, 307 it will only open almost half way, but if you have an engine that makes twice or three times more power than a stock 5.0 litre than those secondaries will flow more cfm, about as much as the engine needs at wot. With holleys, you could always reduce the size of the main body, jet sizes, accelerator pumps and such. These are petty modifications that only increase or decrease the cfm ratings by very little, so getting a proper carb for your application is best.