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Old 11-11-2012, 07:37 PM
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Remove the carb and study the intake. If it's the factory 4 barrel intake of that year, then it will have a hole on both sides of the intake, in front of the primary side. These 2 holes will be connected by a trough. These holes are connected to the heat riser passage of the heads. The job it has is to heat the carb for easier starting and to prevent butterfly icing in cold weather. If a standard carb gasket was used, these 2 holes are open and they push exhaust gas into the incoming fuel mixture, greatly diluting it and robbing power because exhaust gasses cannot be burned twice. These intakes require a special gasket which was paper gasket on the bottom, a thin aluminum plate, then another paper gasket. This seals off the holes so it just heats the carb, the exhaust gasses are blocked from entering the incoming air mixture. Check to see if your intake has this gasket, if it does not that's half it's problem. The picture I'm attaching isn't the intake you have, but the example is the same.
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