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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

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Old 03-16-2013, 10:59 AM
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tasboj tasboj is offline
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What can you tell me about this spark plug?

Hey guys here to pick your brains a little, I installed a new Holley 2bbl 500 cfm carb,and it runs fine according to me,but the tail pipe of my exhaust have turned black inside,like if a rick condition exist, but my plugs read lean, plus I get this gas smell wen the truck is at idle,what do you guys read wen you look at this plugs?Here are some pictures. Thanks in advance for your input.

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Old 03-16-2013, 12:25 PM
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Very lean at lower rpms, might be on the rich side at the higher end though. Get it up to temperature, then do a hard run and shut it down quick, without idling. Pull a couple plugs to see then, but use caution restarting since it'll probably backfire.
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Old 03-16-2013, 05:56 PM
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Today's fuels give a different plug reading compared to non ethanol gas.
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