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Champion 668 V55C 14mm Alky Spark Plug, .46 Reach 5/8 Inch Hex, Colder

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What's in the Box

Champion Racing Series plugs include all the features of their conventional plugs, but are built with extreme engine conditions and durability in mind.  For GM & Ford cast iron cylinder heads and some OE design aluminum heads. Will not fit GT40 heads.

  • Nickel Alloy Ground and Center Electrodes
  • Copper Core Center Electrode Allows for Increased Conductivity and Heat Control
  • Peanut Plug
  • 14mm, .460" reach, 5/8" hex
  • Projected Tip
  • Recommended for Alcohol
  • Heat Range: Colder (55)

Champion Spark Plug Guide (GIF)

Champion Heat Range Guide (GIF)

Champion Conversion Chart (GIF)

Spark Plug Gapping Instructions (GIF)

Autolite, Champion, NGK Cross Reference Chart (PDF)

Notes

While 5/8" (16mm) and 13/16" are the two most common plug hex sizes, plugs can have a hex as small as 8mm or larger than 1".

If you're a tuner or engine builder in search of the perfect spark plug for your current project, pay special attention to the hex size required.  Remember to take into consideration not only the diameter of the cylinder head, but also the added thickness of the plug socket needed for installation.

A spark plugs reach is calculated by the length of the threads.  It is measured from the seat of the plug to the end of the threads.

It should be noted that the reach does not include the electrodes, or an extended metal shell.  When custom-selecting a spark plug, the electrode length and projection should be included in the calculation when taking into consideration the clearance in the combustion chamber.

WARNING: Spark plugs with different seat types are NOT interchangeable.

  • Spark plugs with a flat seat must be used in engines designed for a gasket seal.   
  • Spark plugs with a tapered seat must be used in engines designed for a tapered seal.

 Use of an improper plug in an engine will result in engine damage.  

Item Details

14mm, .460" Reach, 5/8" Hex

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  • Nickel Alloy Ground and Center Electrodes
  • Copper Core Center Electrode Allows for Increased Conductivity and Heat Control
  • Peanut Plug
  • 14mm, .460" reach, 5/8" hex
  • Projected Core Nose
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Champion Spark Plug Guide (GIF)

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  • Nickel Alloy Ground and Center Electrodes
  • Copper Core Center Electrode Allows for Increased Conductivity and Heat Control
  • Peanut Plug
  • 14mm, .460" reach, 5/8" hex
  • Projected Tip
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Champion Spark Plug Guide (GIF)

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  • Nickel Alloy Ground and Center Electrodes
  • Copper Core Center Electrode Allows for Increased Conductivity and Heat Control
  • Peanut Plug
  • 14mm, .460" reach, 5/8" hex
  • Recommended for Alcohol
  • Projected Tip
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Champion Spark Plug Guide (GIF)

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Champion Conversion Chart (GIF)

Spark Plug Gapping Instructions (GIF)

Autolite, Champion, NGK Cross Reference Chart (PDF)

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  • Nickel Alloy Ground and Center Electrodes
  • Copper Core Center Electrode Allows for Increased Conductivity and Heat Control
  • Peanut Plug
  • 14mm, .460" reach, 5/8" hex
  • Projected Tip
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Champion Spark Plug Guide (GIF)

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  • Nickel Alloy Ground and Center Electrodes
  • Copper Core Center Electrode Allows for Increased Conductivity and Heat Control
  • Peanut Plug
  • 14mm, .460" reach, 5/8" hex
  • Projected Core Nose
  • Heat Range: Colder (57)

Champion Spark Plug Guide (GIF)

Champion Heat Range Guide (GIF)

Champion Conversion Chart (GIF)

Spark Plug Gapping Instructions (GIF)

Autolite, Champion, NGK Cross Reference Chart (PDF)

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