Carb question - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

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post #1 of 3 (permalink) Old Sep 24th, 02, 12:58 AM Thread Starter
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Join Date: Aug 2002
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Have a Holly 4brl with a 327 engine. Seems to me like it is running rich plus I am getting crappy mpg. How does one set the fuel/air mixture correctly? Do I need to take it to a shop with sofisticated equipment?

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post #2 of 3 (permalink) Old Sep 24th, 02, 03:39 AM
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Location: Clermont, FL
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You can go to for tech articles on how to set up the jets in the carb using a vacumn guage. I have a Holley 4150 600cfm on a 327 and get 15mpg. You may also want to check your power valve to be sure it is not blown.

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post #3 of 3 (permalink) Old Sep 24th, 02, 05:56 AM
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I had the same problem with my 750CFM Holley. Changed the jets to #70 (comes with #72) but, the problem persisted. Found out that it was a bad vacuum leak at the intake. If the car is getting that much air, it will want to suck down more gas. Hope this helps.

1969, X-44, Export Model, Hugger Orange, Std. Int., BC Rear(soon to be a BT 12 bolt), PDB, GMPP 350HO, M22 Supercase, SSM Lift Bars, AirGap, Holley 750, FlowMaster American Thunder Exhaust, FlowTech Headers
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