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1966
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Marathon Base, Not Available, 5.3L Eng, Standard Trans
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Repair and Diagnosis (Single Page)
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Engine Performance
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Fuel Delivery
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ROCHESTER 4GC 4-Barrel
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Adjustment
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Float Level (Metal Floats) (Primary & Secondary)
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Carburetors with "Wedge-Shaped" Metal Floats
Carburetors with "Wedge-Shaped" Metal Floats
Two adjustments, "Heel" (Float Level) and "Toe" required on each float as follows:
Fig 1: FLOAT LEVEL ADJUSTMENT (WEDGE SHAPED METAL FLOATS)
Courtesy of GENERAL MOTORS COMPANY