Holley Model 5220 2 Barrel Carburetor

1. Remove air cleaner crossover assembly.
2. Remove canister purge and air pump diverter valve vacuum hose from carburetor.
3. Locate and center punch 1/4 inch from end of mixture screw housing, indexing at approximately 2:00 o'clock position.
4. Using 3/16 inch drill bit, drill through outer section of mixture screw housing at center punch mark.
5. If plug does not pop out when drill bit enters plug cavity, pry out using suitable tool Retain plug for reinstallation.