Inliners International
Posted By: radar GMC 302 Spark Plugs Options? - 10/10/13 08:40 PM
I have been running my 40 Chevy with a mild GMC 302 for 20 years using the same park plugs that came with the used engine. They are Champion 1J11Y. I also have a an HEI distributor powering the plugs. They work fine but I'd like to replace them before they disintegrate. They seem to run just about right heat wise with a light tan color on the insulator. Any suggestions for modern replacement plugs?
Posted By: stock49 Re: GMC 302 Spark Plugs Options? - 10/10/13 11:08 PM
Hi Radar . . .

Green Spark (in the UK) is a great place to get cross reference info to modern plugs (not to mention specs):

The Green Spark Plug Co

You might also check ebay - there's alot of NOS plugs still floating around - for example item 251352595738 is a set of eight J11Ys.

regards,
stock49
Posted By: 50 GMC Re: GMC 302 Spark Plugs Options? - 10/11/13 01:44 AM
NGK 3332 plugs work great with a high voltage coil and/or an HEI. I am running a set gapped at 0.050 inches with an HEI distributor and they work much better than the original AC R44 plugs. Starts easier and idles smoother.
Posted By: GH Re: GMC 302 Spark Plugs Options? - 10/20/13 11:01 PM
I run the AC R43 plugs, this is with 6 LS coils and a Mega-Squirt engine management.
Posted By: jimmy six #35 Re: GMC 302 Spark Plugs Options? - 10/24/13 03:10 PM
Spark plugs.com. NGK 1/2" reach with washer....Worked for me for many years. Good Luck.........
Posted By: domoautoparts Re: GMC 302 Spark Plugs Options? - 11/28/13 07:29 AM
There are more and more powerful guy, experienced
I converted my old 18 mm plugs over to 14 mm plugs with these adapters. $10 each. Now I can use many 14 mm plugs of various designs and heat ranges.

[IMG]http://img.photobucket.com/albums/v608/6racer/TECH%20IN[URL=http://smg.photobucket.com/user/6racer/media/TECH%20INFO/18mmadaptors02-1.jpg.html]FO/18mmadaptors01-1.jpg[/IMG][/URL]

Posted By: mdonohue05 Re: GMC 302 Spark Plugs Options? - 12/15/13 10:01 PM
Is that a typo, 1J11Y? Or is it J11Y
Posted By: stock49 Re: GMC 302 Spark Plugs Options? - 12/17/13 01:14 AM
 Originally Posted By: mdonohue05
Is that a typo, 1J11Y? Or is it J11Y


As far as I know a '1' in the first position is not a valid part number:

Spark Plugs UK
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