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i just bought a new 650 DP Holley, it has white smoke, do the screws go in or out? i tried both and didnt really matter.
 

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White smoke usually means water is entering the cylinders from somewhere!!! As for the mixture screws, if you turn them in clockwise the motor should start to stumble and try to die if not I would think you have a serious vacuum leak somewhere!!!! Hope it helps
 
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