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Spark plugs
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   Forward Look Technical Discussions -> Engine, Exhaust, Fuel and IgnitionMessage format
 
plymouth
Posted 2018-06-29 10:00 PM (#565817)
Subject: Spark plugs



Expert

Posts: 2189
2000100252525
Location: McComb, Mississippi
My 413 in my Imperial has been upgraded to Mopar electronic ignition. It runs great but I'm going to do a little tune up on the car before I start school in August. A friend of mine gave me 8 new champion spark plugs. RJ14YC is the part numbers. He told me that someone told him that they run really well in Mopar Big Blocks. I am currently running Autolite 85 plugs. Can anyone shed some light on these Champion spark plugs? Does anyone here run them?
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NM Desoto
Posted 2018-06-30 9:44 AM (#565828 - in reply to #565817)
Subject: RE: Spark plugs


Regular

Posts: 69
2525
If the engine has the original compression ratio, I would use the RJ12YC plugs. The 14's are a hotter heat range. I've also had better
performance and plug life with the Chrysler electronic ignition by setting the plug gap at .040.
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plymouth
Posted 2018-06-30 10:09 AM (#565830 - in reply to #565828)
Subject: RE: Spark plugs



Expert

Posts: 2189
2000100252525
Location: McComb, Mississippi
Thank you. I'll try the 12s and will also open the gap up to .040.
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