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Old 10-21-2002, 06:38 PM
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Post what carb has best mpg and performance on 350 chevy?

i have a rochester on my 350 now and it wont idle correct or get good gas milage everyone has told me that they suck. so what should i use and what intake is best and best value?

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Old 10-21-2002, 06:54 PM
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a 650 Holley and an Edelbrock Performer are what your looking for.
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Old 10-21-2002, 07:17 PM
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You want milage and performance...get a good rebuilt quadrajet. The primaries are small for good fuel economy and the secondaries are rather large for good punch. My brother runs one on his 70 blazer and likes it a lot.
However, if you do decide to get an edelbrock...don't, get the new carter AFB, it is the same exact carb but costs less.

[ October 21, 2002: Message edited by: drgnwgn289 ]</p>
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Old 10-21-2002, 08:14 PM
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A sheet metal intake w/ two 1150 Dominators would be economical for ya.
A 600 vac secondaries Holley and an Edelbrock performer,they make good torque and get decent milage.
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Old 10-22-2002, 09:34 AM
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The Holley Street Avenger carb offers an advertised 6% power increase or 5% mileage increase. Plus they say they're pretty much maintance free..
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Old 10-22-2002, 09:48 AM
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It really should not matter which carb you use if it is tuned and working properly. At cruise speed, the butterflies are almost closed. What is needed is to tune the carb to have the highest tolerable air/fuel ratio at that speed. of course when you open the throttle it may no work as well when tuned for mileage. The AFB carb lends itself to easy tuning for mileage because of the sequential metering rod design thus varying the effective jet size. A holley or demon on the other hand uses the same jet size and relys solely on air signal to meter fuel needs. This tends to be a bit less economical.

Q-jets work like the AFB, so I would bet a properly working, well tuned one would work fine. It is possible to get 20 mpg with a carb, but difficult.


Chris
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