Tech QuestionNawaf Al Balushi, east riffa, bahrain, 1974 dodge challenger 440 c.i Dr. Rick, Help me out please! Im driving my 1974 Dodge Challenger with 1978 440 c.i engine under the hood, the engine has a Carter ThermoQuad carb, recently the carb starts farting and hard to start-up sometimes, so I decided to replace it with a new carb. Now considering that my engine runs with an orange E.C.U., my question is: What is the street use cfm you'd recommend? And there is any issue for single or double pump for the street application? The mechanic guy told me that I can't run a 750cfm carb because it will be very rich with fuel and need some electric upgrades. Is that true doc? A little help will be appreciated Yours sincerely, Nawaf- The stock ThermoQuad was 850 CFM. If you feel you must replace it, I'd use either a Holley vacuum secondary spread-bore, or an Edelbrock AVS. Anything in the 750-850 CFM range is fine, as long as the carb has a "demand" type secondary arrangement. Actually, if you run a carb that's way too big, the engine can be lean, but never rich. Your mechanic's statement shows a basic lack of understanding of carburetor operation. My recommendation: The T-Q is VERY easy to rebuild, and kits are widely available. Or buy a rebuilt, or have yours rebuilt, by "Demon Sizzler" see thermoquads.com . The T-Q is the best hot-weather carb ever built, by far! Rick
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