Metering Rod
- To remove metering rod, hold throttle valve wide open. Push metering rod down against spring tension. Slide metering rod out of slot in holder and remove from main metering jet.
- Hold throttle valve fully closed and back out idle stop solenoid. Hold power piston down. Swing metering rod holder over flat surface of bowl casting next to carburetor bore with gasket removed.
- Measure specified clearance between rod holder and carburetor surface. Measurement can be made using specified drill or pin gauge. Clearance should be a "slide" fit. See Fig 1.
- To adjust, gently bend holder arm up or down. Recheck clearance. Reassemble carburetor and install new air horn gasket.
Courtesy of GENERAL MOTORS CORP.