Fix It

Go to the Auto Parts Giant website. (See Resources.) Select the "Year," "Make," "Model," "Sub model (if applicable)" and "Engine Size" for your Silverado. Press "Go." Type the part that you are looking for into the "Search" box. Press "Search." Review the results and identify the part you are looking for. The part number appears in the product description.

Go to the Napa website. Click "Select a Vehicle" and click the features that match your Silverado truck, such as "Year." Enter the part you are looking for in the "Part Number Search" box. Press "Search." The results display the part number.

Launch the Auto Zone web page. Click "Manage My Vehicle" and "Add A Vehicle." Select the details for your Silverado truck and "Look Up Parts." Click on the appropriate category and the specific part to view the part number.

Make a list of the shops in your area. Find a list of them in the phone book or online. Keep your list manageable. Having a list of more than about five to ten shops will take too long to work through. ASE certification is not so rare that you will have to look for very long to find an ASE certified mechanic at a shop.

Call each shop and ask if mechanics there are ASE certified. You can also check the shops websites for information about certification. Cross off shops that do not have any ASE certified mechanics on staff.

Visit some shops on your list. Look on the walls to see the blue ASE logo on certificates of mechanics in the shop that have attained ASE certification. Also check the front door. ASE signage may also be posted on or near it.

Look on the uniforms of the mechanics on duty at the shop. Many of them wear an ASE patch on their sleeves. Many mechanics also carry ASE certification proof on their person as well.

Visit the ASE website (ase.com). Type in your zip code or city and state on the ASE Blue Seal Recognized Business Locator page to find an ASE participating shop in your area.

Look at the right side of your carburetors choke air horn. You should see two numbers there, the top one is your List number and the bottom one is the date code location. The list number will begin with an R and consist of 6 to 8 digits. This is the number you need.

Look for the list number on the top of the main body casting if your carburetor does not feature a choke air horn. If your list number is on the main body casting, your carburetor is probably a model 4500.

Look up the list number on Holleys carburetor parts list. (See Resources.) You will find the model number in the column next to the list number.

Engage the vehicles parking brake and shut off the engine.

Open the vehicles hood.

Examine the inner body panels, firewall, fender wells and hood latch area within the engine compartment to locate the original commission number plate. The commission number plate has a rectangular shape, red border and "Commission No." printed at the top.