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#77388 - 10/10/13 04:40 PM GMC 302 Spark Plugs Options?
radar Offline
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Registered: 05/27/03
Posts: 114
Loc: Fallbrook, CA, USA
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?
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#77389 - 10/10/13 07:08 PM Re: GMC 302 Spark Plugs Options? [Re: radar]
stock49 Offline
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Registered: 04/09/03
Posts: 737
Loc: Medina, Ohio USA
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
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#77391 - 10/10/13 09:44 PM Re: GMC 302 Spark Plugs Options? [Re: stock49]
Ken Offline
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Registered: 06/01/00
Posts: 259
Loc: Yacolt, WA, USA
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.

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#77618 - 10/20/13 07:01 PM Re: GMC 302 Spark Plugs Options? [Re: Ken]
GH Offline
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Registered: 10/30/06
Posts: 185
Loc: Springfield, MO
I run the AC R43 plugs, this is with 6 LS coils and a Mega-Squirt engine management.

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#77690 - 10/24/13 11:10 AM Re: GMC 302 Spark Plugs Options? [Re: GH]
jimmy six #35 Offline
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Registered: 08/31/06
Posts: 288
Loc: So Cal
Spark plugs.com. NGK 1/2" reach with washer....Worked for me for many years. Good Luck.........
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216.158 MPH 12-Port 302 GMC on 70% 171.0 MPH 302 stock head on gasoline 7 years later

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#78109 - 11/28/13 02:29 AM Re: GMC 302 Spark Plugs Options? [Re: jimmy six #35]
domoautoparts Offline
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Registered: 11/18/13
Posts: 21
Loc: Zhejiang Province
There are more and more powerful guy, experienced
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#78117 - 11/28/13 07:50 PM Re: GMC 302 Spark Plugs Options? [Re: domoautoparts]
THE FRENCHTOWN FLYER Online   content
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Registered: 05/04/00
Posts: 1129
Loc: FRENCHTOWN
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]



Edited by THE FRENCHTOWN FLYER (11/28/13 07:51 PM)
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#78344 - 12/15/13 05:01 PM Re: GMC 302 Spark Plugs Options? [Re: THE FRENCHTOWN FLYER]
mdonohue05 Offline
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Registered: 10/31/09
Posts: 157
Loc: pennsylvania
Is that a typo, 1J11Y? Or is it J11Y

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#78367 - 12/16/13 08:14 PM Re: GMC 302 Spark Plugs Options? [Re: mdonohue05]
stock49 Offline
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Registered: 04/09/03
Posts: 737
Loc: Medina, Ohio USA
 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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