Autolite Platinum Spark Plug AP3923
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Autolite Platinum Spark Plug AP3923




Part #AP3923
Ground Electrode DesignTapered
Seat StyleGasket
Metal TypePlatinum
Gap - Factory Preset1.1 mm = 0.044 in
Electrical Terminal TypeStud
Reach (in)0.75
Center Electrode DesignStandard / Regular
Insulator TypeProjected
Center Electrode Core MaterialCopper
Thread Size14 mm x 1.25
Drive Size5/8 in
Ground Electrode ConfigurationSingle
Center Electrode Tip MaterialNickel
Ground Electrode Core MaterialNickel Alloy
Insulator MaterialCeramic
Resistance (Ω)4000
Ground Electrode Tip MaterialNickel
Package Quantity1


Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. Designed and engineered in the USA, Autolite platinum spark plugs provide a center wire platinum firing tip which provides reduced gap erosion, fewer misfires, better performance and increased durability. Consider upgrading to Autolite double platinum or iridium XP spark plugs for increased performance.

  • checkmarkHigh nickel alloy side electrode maintains precise gap
  • checkmarkFull platinum tip assures virtually no gap erosion for long life
  • checkmarkNecked-down center electrode fires quicker, cleaner with less voltage for easier starts, quicker acceleration and improved fuel economy (as compared to standard plugs)
  • checkmarkOE design