Jim Neville Posted October 12, 2022 Report Share Posted October 12, 2022 Hello all. Love this site. It really helps a rookie getting Into the Mopars. Finally going to change plugs in my 251 L Head. My shop manual calls for Auto Lite Resistor AR5 plugs but I see previous post that AR8's are used. Not sure which way to go. Also being from Canada what would be a good brand to buy here. Auto Lite is not available here. Quote Link to comment Share on other sites More sharing options...
Sniper Posted October 12, 2022 Report Share Posted October 12, 2022 An AR8 is hotter than an AR5. If you have a fouling issue a hotter plug might help, too hot and it'll ping. Any good parts store should be able to cross those numbers. Quote Link to comment Share on other sites More sharing options...
Paulo Windsor Posted October 12, 2022 Report Share Posted October 12, 2022 Hello from Potugal. I use B4 NGK in my 47 Windsor for 30 years with 0 problems. Good luck. Paulo Windsor 1 Quote Link to comment Share on other sites More sharing options...
greg g Posted October 14, 2022 Report Share Posted October 14, 2022 AC 45r have served me well. Going on 50k miles on the set I installed at my rebuild. Quote Link to comment Share on other sites More sharing options...
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