Wide Open Throttle Microswitch

Remove air cleaner and carburetor. Connect ohmmeter to microswitch. See Fig 1 . Check that resistance between microswitch terminals is infinity.

Fig 1: Connecting Ohmmeter to WOT Microswitch
Courtesy of GENERAL MOTORS CORP.
Open throttle valve gradually until ohmmeter indicates zero ohm. Using a vernier caliper, measure clearance between throttle valve and primary carburetor bore.
Clearance should be .28-.33" (7.2-8.4 mm). If clearance is incorrect, bend WOT microswitch lever to adjust clearance. See Fig 2 .

Fig 2: Adjusting WOT Microswitch Lever

Courtesy of GENERAL MOTORS CORP.