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ROCHESTER 4GC 4-Barrel: Adjustment: Unloader

With throttle valves wide open, clearance between upper edge of choke valve and dividing wall of air horn should be as indicated in specifications. To adjust, bend tang on fast idle cam (on a few models adjustment is made by bending unloader tang on pump lever).

Fig 1: UNLOADER ADJUSTMENT (TYPICAL)

Courtesy of GENERAL MOTORS COMPANY