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I have a 71 Corvette 327, blown, 6-71, with 2 holley 700 and msd ing. The motor was just redone. On the dyno the fuel mixture is right. In the car it fouls a set of plugs every 60 to 70 gallons. Is this common? Someone asked me the other day the same ??? Any ideas?? Thanks
 

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You didn't say whether thay are oil or fuel fouled.If its fuel go up a step at a time with plugs,don't make any big changes at one time. The dyno and the street are two different things and I would think you are rich at idle or plugs are too cold
 

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Doug, do your carbs have electric chokes? If so you may need to lean out
the choke settings, your problem may be a matter of accumulation during
periods at idle. If you can't stand behind the car(at idle) without being
immediately fumed out then yes it still too rich.C'ya, Jooooooe
 

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Why don't you take a five gallon bucket and pour the fuel in. This is a case of over do for the street. Two 450s would be more like it.It just won't burn that much fuel driving around. ROY
 
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