Secondary Closing

This adjustment required to ensure proper closing of secondary throttle valves. With primary throttle valves closed in correct curb idle position (see IDLE SPEED ADJUSTMENT ) and with cam follower not contacting fast idle cam, check clearance between actuating link and front of slot in secondary lever when tang on Primary actuating lever is against pin (see Fig 1). This clearance should be.020" (all carburetors). Adjust by bending tang on primary actuating lever as required.

Fig 1: Secondary Opening Adjustment

Courtesy of GENERAL MOTORS COMPANY

Fig 2: Secondary Closing Adjustment

Courtesy of GENERAL MOTORS COMPANY