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How do you set a 4 barrel carb for a 305 chevy.

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You will have to make sure the mixture screws are not blocked with a plug,if they are the carb,will have to be removed and the plugs taken out,but the mixture screws can be turned all the way in,with engine off.Then turn both mixture screws out two and a half turns,then start the engine ,and allow the engine to warm up to normal operating temp.Now,turning the mixture screw on the drivers side out,or in just a fraction at a time until the engine smooths out to the best running possible,then move to the other side and do the same.

Posted on Sep 11, 2010

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