Thread: which carb?

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Well had a fire in my engine yesterday and have to get a new carb along with some new wires, etc. My question is I've always run carters, and edelbrock carbs. Nothing against the edelbrock, but was thinking of going with something different. Any ideas on Holleys, Demon. Looking for 600-650 cfm carb.

Post the specs of your engine and your driving style (street, drag race, road race, show car only, etc) here and we can then figure out which carb size you will need.

Bill my engine is a bored 305 to 315 with a fairy aggressive cam, with headers, dual plane intake and was running a 600 cfm carb which shows it being a little to big for my engine, but I've run a 650 before with no hesitation at all thru out the rpm range so I know the engine is OK with the larger carb. It's rated at 303 HP and 313 lbs. Used mostley for street driving but I hit the strip 3 or 4 times each year. I'm running stock heads that have been ported but will be changing to better flowing ones this summer.

Originally Posted by chevy 37

Bill my engine is a bored 305 to 315 with a fairy aggressive cam, with headers, dual plane intake and was running a 600 cfm carb which shows it being a little to big for my engine, but I've run a 650 before with no hesitation at all thru out the rpm range so I know the engine is OK with the larger carb. It's rated at 303 HP and 313 lbs. Used mostley for street driving but I hit the strip 3 or 4 times each year. I'm running stock heads that have been ported but will be changing to better flowing ones this summer.

I would try a 525 Road Demon carb.

Erik has the right idea, when it comes to carbs and engines, bigger is not always better. Nor will a bigger carb make more power.......With that said, I suggest a 600cfm Holley double pumper, after that find yourself someone with a chassis dyno that offers carb tuning services and have them spend an hour or two properly tuning the carb to the engine. I'll bet that you'll make more power with the holley 600 than your old carb, not to mention you'll have better (read this as crisp) throttle response to boot..........

Bill S.

Originally Posted by chevy 37

Bill my engine is a bored 305 to 315 with a fairy aggressive cam, with headers, dual plane intake and was running a 600 cfm carb which shows it being a little to big for my engine, but I've run a 650 before with no hesitation at all thru out the rpm range so I know the engine is OK with the larger carb. It's rated at 303 HP and 313 lbs. Used mostley for street driving but I hit the strip 3 or 4 times each year. I'm running stock heads that have been ported but will be changing to better flowing ones this summer.

If we use this formula
CID x MAX. RPM. DIVIDE BY 3456
With 315 Cubes and 6,000 rpms this works out to be 546 CFM.
This is based off 100% VE a good street engine would be at say 85% and this number then would be 464 CFM.
I rounded up to the next size which would be the 525 CFM Demon carb.

Thanks guys for all the info. Have some deciding to do.

600 vacuum sed, like street avenger