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Mopar - Champion Spark Plug Cross Reference Chart from 1978

Discussion in 'Performance' started by Fast Eddie, May 1, 2015.

  1. Fast Eddie

    Fast Eddie Valued Member
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    Mopar - Champion Spark Plug Cross Reference Chart.jpg Going through some old paperwork from my dyno days at Chrysler and found this old spark plug cross reference chart for Mopar and Champion plugs. Maybe it can be of use to someone?
     
    MPE426HEMI and Dave Z like this.
  2. floridaman2013

    floridaman2013 Active Member

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    Man, looking at some of those numbers brings back memories of tune ups on some old engines, lots of big blocks.
     
  3. ImperialCrown

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    I remember changing Mopar branded spark plugs. They were made by Champion for Mopar. I still have some in my toolbox.
    The early Lean Burn big blocks used the wire-tip platinum plugs that often became carbon-fouled. They seemed to run better with conventional spark plugs.
    I'm surprised by the number of non-resistor offerings.
     
  4. Dave Z

    Dave Z It's me, Dave
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    Wow - useful! Another forum member sent me a box of Mopar plugs...
     
  5. chargermike

    chargermike Active Member

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    I have a Box of 10 mopar spark plugs 3755840 557P. BL13y according to the chart. What do they /did they fit?
     
  6. Dave Z

    Dave Z It's me, Dave
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    Champion BL-13Y - look it up on the Champion site? Also NGK BP5FS
     
  7. ImperialCrown

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    Has this got a 'thin wire' electrode?
     
  8. chargermike

    chargermike Active Member

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    I don`t think so but I will have to check them and get back with you.
     
  9. Dave Z

    Dave Z It's me, Dave
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    Modern version is RBL-13Y, you may find more results for that.
     
  10. chargermike

    chargermike Active Member

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    after a search online apparently they fit 1975 slant six engines. my 77 parts books show 558p and RBL15y plugs for a slant six.
     

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