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Old 08-05-2010, 02:06 PM
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Running rich on 6 cylinders, lean in 2?

Hello, i have a question about the 383 engine in my trans am. When I first got the engine, all plugs were rich with the edelbrock carb that was on it. That was a while ago, ive had a new holley 750 double pumper with a proform mainbody on it for about 3 months. I havent really been looking at the plugs alot, but a few weeks ago i changed the plugs to some new ones, i noticed that #1 and #4 cylinders were a tan color, and the rest were wet and black.

Yesterday, I checked the plugs just to see whats all been going on. #1 and #4 were white/tan and all the rest were slightly rich, but not as bad at the last time. What would make just those 2 cylinders run lean and the rest rich? Ive looked for vaccum leaks, but could not find any. I dont have a compression tester and verified that the valves are at the right lash.

If anyone has any info, i would appreciate it! Thanks

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Old 08-05-2010, 08:25 PM
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What intake manifold is on it?? Cylinders 1 and 4 pull from same corner of carb on most dual planes IIRC
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Old 08-08-2010, 04:11 PM
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You were correct! I took my carb completely apart and cleared all passages. Didnt find anything.. but when i reinstalled the carb and retuned, i have all 8 plugs at a nice tan color after a drive. Thank you.
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