You absolutely cannot rely solely on the engine displacement. Using the wrong spark plugs can lead to poor performance, misfires, engine damage, and even catastrophic failure.
To find the correct spark plugs, you need to:
1. Identify the exact year and model of your Dodge vehicle.
2. Locate the engine code. This is usually a combination of letters and numbers (e.g., 360 Magnum, LA series, etc.). Your owner's manual is the best place to find this.
3. Consult your owner's manual. The manual will specify the exact recommended spark plug type, including heat range and gap.
4. Use a reliable online parts catalog. Websites like AutoZone, Advance Auto Parts, or Napa Auto Parts allow you to search by year, make, model, and engine code to find the correct spark plugs.
Do not attempt to guess or use a generic spark plug. The consequences can be serious and costly. Always refer to the official recommendations for your specific vehicle.