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Which plug?

Old Jul 19, 2009 | 06:40 PM
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Default Which plug?

NGK-TR55 or Delco Iridiums?
Anyone know the Delco Iridium part number?
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Old Jul 19, 2009 | 07:27 PM
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Hi There:
If your a racer & like frequent plug changes( 30k-40k) tr55 are for you.
If for the street iridium plugs are best a/c delco p/n 41-985 gapped at .040
robsc501
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Old Jul 19, 2009 | 08:23 PM
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Originally Posted by robsc501
Hi There:
If your a racer & like frequent plug changes( 30k-40k) tr55 are for you.
If for the street iridium plugs are best a/c delco p/n 41-985 gapped at .040
robsc501
No racing...stock LS1, thanks for the info.
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Old Jul 20, 2009 | 09:14 AM
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Update:
just pulled all the plugs, they are #41-952.
Manual calls for the same # (41-952)?
Also, manual says to gap at- 0.60?

So, which is correct?

EDITJust completed a search, found a "bulletin" indicating the changes. Thanks!

Last edited by SEE3ER; Jul 20, 2009 at 09:29 AM.
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Old Jul 20, 2009 | 11:06 AM
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I used the Delco Iridiums in my last C5 - good price and they performed very well. Got them from Gene at www.gmpartshouse.com.
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Old Jul 20, 2009 | 11:49 AM
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Originally Posted by robsc501
Hi There:
If your a racer & like frequent plug changes( 30k-40k) tr55 are for you.
If for the street iridium plugs are best a/c delco p/n 41-985 gapped at .040
robsc501
yup while you're at it, do the GM performance wires
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