What is the recommended spark plug for a 1984 Thunderbird 302 V8?

The recommended spark plug for a 1984 Thunderbird 302 V8 depends on whether it has a distributor or electronic ignition and the specific engine code (which can be found on a tag on the engine). However, a common and generally suitable replacement is the Autolite AR3924. This is a good starting point.

Important Considerations:

* Check your owner's manual: This is the best source for the manufacturer's recommended spark plug. The manual will specify the heat range and gap.

* Engine Code: The engine code will help you determine the exact specifications needed. Different engine codes may require different spark plugs.

* Heat Range: Using the wrong heat range can lead to engine damage. Too hot, and you risk pre-ignition; too cold, and you'll foul the plugs.

* Gap: The spark plug gap must be correct for proper ignition. Use a spark plug gap tool to adjust it as needed.

If you can't find your owner's manual or the engine code, a parts store (like AutoZone, Advance Auto Parts, or Napa Auto Parts) can look it up using your vehicle's VIN. They can also help you find the correct spark plug. Providing them with the year, make, model, and engine size will help them give you the most accurate recommendation.