Thread: 4bbl on a 250?
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Old 12-04-2005, 01:07 PM   #7
LONGHAIR
just can't cover up my redneck
 
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
Re: 4bbl on a 250?

Quote:
Just to be clear, the 2bbl I was looking at, also had vac. secondaries....so I don't know if that changes any advice above.
It has what???????????????

IIRC the CFM ratings are different for 2V Carburetors. I think it has something to do with the level of vacuum at which they are tested. So this is not a linear comparison. (IE, a 500cfm 4V and a 500cfm 2V flow at a different rate)

I would say that to find the ideal carb, you really need to try both. Generally I think the 4V would get better mileage.........if you can keep your foot out of it and worse if you can't.

Last edited by LONGHAIR; 12-04-2005 at 01:07 PM.
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