Copper Spark Plug
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Copper Spark Plug
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Autolite Copper Spark Plug

Part No. 303 Warranty Details  

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Autolite Copper Spark Plugs are guaranteed to deliver quick starts, good fuel economy and smooth acceleration.

Product Features:
  • Copper cored center electrode for higher thermal conductivity
  • Specially engineered high nickel alloy center and ground electrode for extended life
  • High alumina ceramic for high dielectric strength
  • Leak proof, heat fused internal seal for durability
  • Multi-rib insulator prevents flash-over
  • 2 year limited warranty
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Electrode Tip Material:Resistor
Reach:3/8 in
Seat Type:Gasket
Thread Diameter:14 mm
Tip Configuration:Standard
Wrench Diameter:13/16 in


by PowerReviews
AutoliteCopper Spark Plug

(based on 1 review)

Ratings Distribution

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  • 1 Stars



Reviewed by 1 customer

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(0 of 1 customers found this review helpful)


Very Nice


from VA

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3 or more reviews submitted


  • Durable
  • Easy To Install
  • Improves Engine Efficiency
  • Increases Power
  • Lightweight


    Best Uses

      Comments about Autolite Copper Spark Plug:

      Very Nice.

      Comment on this reviewHelp Icon

      Do you have questions about this product?


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      1 Question | 1 Answer
      Displaying question 1
      • Q:

        I have two of these plugs in my 4horse power 1973 johnson outboard motor engine, just wondering how much i need to gap these pugs?
        Asked on 7/10/2010 by Diggum from Norton, OH

        1 answer



          You need to gap them according to what the manufacturer of that engine asks for.

          Answered on 7/10/2010 by Kevin from AAP
      Displaying question 1

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