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Old 11-26-2014, 08:20 PM   #32
jcw31
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Join Date: Jan 2013
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Default Re: Spark plugs

to MEXJOE and Alan sorry for going a little sideways but i am not sure there is a good or bad plug.I dont think these companys take the time to sort plugs for different tiers ,too costly. Ive seen on the dyno v59yc,ar3910
Autolite,r5671a-8 ngk all were within 1 hp .When Autolite came out with their ar racing plugs we were using 23s changed to ar 13 driver came in after the heat and said plugs were garbage went back to 23s and was happy. In a small block mopar drag car ran n9yc champ tried 63 autolite car slowed .05 .I saw a 440 mopar on the dyno 414s accels egt was good a/ f was good 1st time out 2runs the plugs were peppered like crazy. I believe plugs from different companys even though crossed to the same the heat range is a little different.
Alan if you need rc12yc pm, me. I think with any plug unless extremely cold or hot, just changes in timing/jetting can make the engine happy.

Have a happy Thanksgiving everyone
Joe
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