Copper Spark Plug
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Autolite Copper Spark Plug

Part No. 104 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:.708 in
Seat Type:Tapered
Thread Diameter:14 mm
Tip Configuration:Power
Wrench Diameter:5/8 in

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2 Questions | 2 Answers
Displaying questions 1-2
  • Q:

    What is the difference between plugs part number 104 and part number 764? Will they both work on a 2003 Mustang GT?
    Asked on 4/12/2016 by 93stang

    1 answer



      Hi Customer, glad to help you! Both these spark plugs part numbers 764 and 104 is an exact fit for your 2003 Ford Mustang GT. The Autolite Copper Core Resistor Spark Plug (Part No. 764) is a non-projected insulator type spark plug and the spark plug reach is 0.807 inch whereas Autolite Racing Copper Core Resistor Spark Plug (Part No. 104) is a projected insulator type spark plug and the spark plug reach is 0.708 inch.

      Answered on 4/14/2016 by Steve from AAP
  • Q:

    How often do these need to be changed out in comparison to platinum (doubles) or iridium spark plugs in a 1997 Pontiac Grand Prix GTP?
    Asked on 11/19/2011 by John B

    1 answer



      That is dependant on the application and condition of the engine. High revving engines, driven hard, will wear plugs much more quickly than a large engined car which is used for cruising. Standard copper plugs usually have an estimated service life of 10,000 to 20,000 miles depending upon design and application.

      Answered on 11/22/2011 by John the Car-Doc from AAP
Displaying questions 1-2

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