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FED 387 · 02-10-2015, 09:56 PM

Glen--- the Autolite numbering system is--- the lower the number the hotter the plug or the higher the number the colder the plug-- for example a AR13 would be a hotter plug than a AR24 would be or a AR 3332 is hotter than a AR 3333--not sure of how many choices you have in between AR13 and AR24------- FED 387

02-10-2015, 09:56 PM	#6
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,422 Likes: 532 Liked 333 Times in 180 Posts	Re: Autolite AR SPARK PLUG HEAT RANGE CHART Glen--- the Autolite numbering system is--- the lower the number the hotter the plug or the higher the number the colder the plug-- for example a AR13 would be a hotter plug than a AR24 would be or a AR 3332 is hotter than a AR 3333--not sure of how many choices you have in between AR13 and AR24------- FED 387