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MEXJOE · 02-10-2015, 09:24 PM

I guess what I'M looking for is a chart that would show the heat range. Or how the numbering works,
ie: is AR13
hotter than AR24? ECT.

02-10-2015, 09:24 PM	#5
MEXJOE Senior Member Join Date: Jun 2008 Location: nhranumbers.com Posts: 875 Likes: 137 Liked 165 Times in 51 Posts	Re: Autolite AR SPARK PLUG HEAT RANGE CHART I guess what I'M looking for is a chart that would show the heat range. Or how the numbering works, ie: is AR13 hotter than AR24? ECT. __________________ Glen DeMenge 1969 Camaro Stock Eliminator Last edited by MEXJOE; 02-10-2015 at 09:27 PM.