post #1 of Old 04-23-2013, 02:47 PM Thread Starter
DickDickle
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I was given a bunch of brand new champion spark plugs and I was wondering if I could use any in my zj. I got a box of 322(rn11yc4), 332(rn7yc), rn9yc, rn12yc, rs14Lc and a box of rn14mc5

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post #2 of Old 04-23-2013, 05:11 PM
dylantheheeler
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4.0 engine? Those are all copper core plugs. Any of those should be fine in your grand, gapped correctly.


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post #3 of Old 04-23-2013, 05:19 PM Thread Starter
DickDickle
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Yes its the 4.0 thanks for the input I'm going to compare stock thread length before I install any one them or start the engine
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post #4 of Old 04-23-2013, 09:04 PM
jnicewan
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Some of those plugs wont fit, others have different heat ranges. The OEM number is 412 or RC12LYC. You can go to championsparkplugs.com and scroll down to the learning center and find "charts & tools and a link to the champion spark plug numbering system and see what all those letters/numbers mean.
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post #5 of Old 04-24-2013, 03:07 AM
Uniblurb
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So are there only 4 per box and you need 6? At only $12 for 6 new plugs ($2/ea at Autozone, Advance does not sell them), correct ones are Champion Copper RC12LYC as jnicewan pointed out, believe I'd sell those or give them away. It's not worth having mixed plugs or changing heat ranges for $12.
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post #6 of Old 04-24-2013, 05:04 AM
ratmonkey
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Don't mix and match your plugs.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #7 of Old 04-24-2013, 05:37 AM Thread Starter
DickDickle
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Sorry I should have mentioned that I have 8 of each spark plug I listed, no plans to mix and match I was just curious if I could use any of the plugs I listed or if they are useless to me
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