Thread: spark plug type for 351E
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Old April 20th, 2015, 10:22 PM
dean351E dean351E is offline
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Location: Ferrisburgh, Vermont
Truck: 66 GMC 2500 351E
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Default spark plug type for 351E
What kind of spark plugs are you using for the 351E (1966 GMC 2500 in my case)? The manual calls for an AC C44NS which far as I can tell is no longer produced. The auto parts store cross-referenced this to a Champion RN14YC (also called type 405) but in what little I've been able to find online I've also seen an RN11YC specified. I know the difference is heat range, but is that a 3-plug difference in heat range? Which one is ideal? What are typical plugs used for this application today?
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