When selecting spark plugs for a 383 stroker engine with aluminum heads, it's crucial to choose the right type to ensure optimal performance and longevity. The ideal spark plug will depend on various factors, including compression ratio, fuel type, and intended use.

Recommended Spark Plugs

For a 383 stroker with aluminum heads, the following spark plugs are highly recommended:

NGK Spark Plugs

NGK spark plugs are widely regarded as excellent options for high-performance engines. For a 383 stroker, consider:

  • NGK BKR6E: This plug offers a heat range of 6, suitable for most 383 stroker applications.
  • NGK R5671A-8: A popular choice among drag racers and performance enthusiasts.

AC Delco Spark Plugs

AC Delco plugs are known for their reliability and are often recommended by GM:

  • AC Delco R44LTS: Suitable for general street and performance use.
  • AC Delco R42LTS: A colder plug, ideal for competition racing.

Autolite Spark Plugs

Autolite offers quality plugs that perform well in stroker engines:

  • Autolite AP3924: Recommended by some aftermarket cylinder head manufacturers.

Spark Plug Heat Range

The heat range is crucial for 383 stroker engines. A heat range of 6 to 8 is typically suitable, with lower numbers indicating hotter plugs. For high-compression or forced induction setups, consider using a colder plug.

Spark Plug Gap

For a 383 stroker with an HEI distributor, the recommended spark plug gap is:

  • 0.035" to 0.045" for street applications
  • Up to 0.060" for high-performance setups with strong ignition systems

Always consult your engine builder or tuner for the optimal gap for your specific build.

Material Considerations

For 383 stroker engines, consider these spark plug materials:

  • Copper: Excellent conductivity, but shorter lifespan
  • Platinum: Longer-lasting than copper, good for street use
  • Iridium: Best performance and longevity, ideal for high-performance applications

Installation Tips

When installing spark plugs in your 383 stroker:

  • Use anti-seize compound on the threads
  • Torque to manufacturer specifications (typically 15-20 ft-lbs)
  • Replace plugs every 20,000-30,000 miles for street use, or more frequently for racing applications

Remember, the best spark plug for your 383 stroker may require some experimentation. Monitor your engine's performance and plug condition to fine-tune your selection.

FAQs About Spark Plugs for 383 Stroker Engines

    • Can I use the same plugs as a stock 350 engine?
      While similar, a 383 stroker may benefit from a colder heat range due to increased compression and power output.
    • How often should I change spark plugs in my 383 stroker?
      For street use, every 20,000-30,000 miles. For racing or high-performance applications, inspect and replace more frequently.
    • Is there a significant difference between copper and iridium plugs for a 383 stroker?
      Iridium plugs offer better performance and longevity, but copper plugs are more affordable and still perform well in many applications.