Racing Spark Plugs

For racing and other high performance engines, Autolite Iridium XP Enhanced Alloy Technology™ Spark Plugs offer an iridium-enhanced .6mm finewire with better overall ignitability and durability in a Hi-Performance category. In addition, the Autolite Revolution HT® High Thread spark plugs are specifically designed for Hi-Performance deliverance in Ford Motor Company®'s 4.6L, 5.4L, and 6.8L 3-valve engines.

Autolite Racing® Hi-Performance Spark Plugs

For racing and other high performance engines, Autolite Racing spark plugs are designed by engineers with a passion for racing to help engines achieve their maximum output under extreme conditions.

Autolite highly recommends that you consult with your vehicle’s owner’s manual for any specific instructions for changing the spark plugs.  Engines can vary widely by make and model.  These instructions should be considered for general guidance only.  

Replacing spark plugs can be a simple job, if you take things one step at a time. Given a basic understanding of mechanical matters, here's a guide to the proper procedures in changing spark plugs.

  1. Carefully remove the spark plug wires. Grasp the plug wire boot, twist about one-quarter turn to break the seal, then lift straight off. Use plug boot pullers if the boot doesn't break free easily. Number plug wires with tape as you remove them to avoid crossing them. (illus. 1)
  2. Loosen each spark plug so it can be removed. Clean the seat area with a blast of compressed air, or by blowing through a soda straw. This prevents dirt from falling into the combustion chamber when the old plugs are removed. (illus. 2)
  3. Remove the plugs and line them up in cylinder order. Inspection of the firing ends of the plugs can identify a number of engine problems that may need correction. (illus. 3)
  4. Gap new plugs as recommended in your owner's manual. Use a feeler gauge to measure the gap between the center and ground electrode. The gauge should pass through snugly but easily. If it's too loose or too tight, reset the gap.
  5. Screw new plugs in by hand until tight. If the plug starts to go in hard, use a thread chaser to clean the threads. Use a torque wrench to tighten the spark plugs following the manufacturer's recommendations. If you don't have a torque wrench, see the bottom of the torque chart for hand tightening recommendations.
  6. Replace spark plug wires in the correct order. Check to see if the boots are brittle or cracked, and if there is corrosion on the connector inside the boot. If any of these conditions are present, the spark plug wire should be replaced.
  7. Start the engine. If it misfires or idles roughly, the wires are crossed or not connected to the plugs correctly. Check the firing order and connections closely.

Sparkpluginstallation InstructionsIf you have any questions regarding your Autolite spark plugs, call Autolite Answers to consult with one of our technicians.  Autolite Answers  855-200-5200

  • Yttrium-Enhanced Alloy enables up to 8% reduction in sidewire temperature for colder heat ranges designed to enable performance modifications and handle intense conditions.*
  • Cut back ground electrode for better ignitability of the flame kernel
  • Anti-corrosive nickel plating to prevent rusting better than black oxide

* Testing performed by independent lab