6066 (1960-1966) GMC Truck Club - spark plug type for 351E

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- - spark plug type for 351E (https://6066gmcclub.com/showthread.php?t=48753)

dean351E

April 20th, 2015 10:22 PM

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?

TJ's GMC

April 22nd, 2015 09:18 PM

Re: spark plug type for 351E

I use NGK plugs in my 305E...I'll get some numbers for ya.

Clyde

April 23rd, 2015 12:56 AM

Re: spark plug type for 351E

I used NGK Iridium from Advance Auto #6637 in my 1966 GMC 3/4T Pickup with a 351 V6.

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