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Expert
Posts: 2264
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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Veteran
Posts: 145
| 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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Expert
Posts: 2264
Location: McComb, Mississippi | Thank you. I'll try the 12s and will also open the gap up to .040. |
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