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spark plug cross reference #747274 07/13/10 09:41 AM 07/13/10 09:41 AM
Joined: Mar 2008 Posts: 724 PA USA F flatiron OP super stock
flatiron OP super stock F Joined: Mar 2008 Posts: 724 PA USA	Trying to cross reference plugs and it's not going well. I am currently running a champion RN11YC4 and we feel it's to hot of a plug and I'm looking at Autolite's 403 or a AR-51. Are these 5/8 plugs and were are they as far as heat range goes when compared to what I'm running?

Re: spark plug cross reference [Re: flatiron] #747275 07/13/10 10:11 AM 07/13/10 10:11 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Here's one I pulled up http://www.angelfire.com/extreme4/skidoolympique/SPARK_PLUG_CROSS_REFERENCE.htm

Re: spark plug cross reference [Re: flatiron] #747276 07/13/10 02:15 PM 07/13/10 02:15 PM
Joined: Jan 2003 Posts: 6,531 Jacksonville, FL Chris2581 master
Chris2581 master Joined: Jan 2003 Posts: 6,531 Jacksonville, FL	www.sparkplugs.com Nautilus Racing- We use Superformance gaskets and Turbo Action converters/products.

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