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LS1 Iridium spark plug gap?

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Old Mar 17, 2013 | 01:50 PM
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Default LS1 Iridium spark plug gap?
I'm installing a set of Iridium plugs on my C5 LS1 and have read different forums on the recommended plug gap for Iridium plugs. GM changed the spec from .060 to .040 but both gaps are available. Has anyone had any good or bad experiences with either?
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Old Mar 17, 2013 | 03:04 PM
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Go with 0.040". Many people have reported misfires or low rpm surging with the 0.060" gap.
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Old Mar 17, 2013 | 04:08 PM
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Old Mar 17, 2013 | 06:34 PM
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Originally Posted by rlarson
I'm installing a set of Iridium plugs on my C5 LS1 and have read different forums on the recommended plug gap for Iridium plugs. GM changed the spec from .060 to .040 but both gaps are available. Has anyone had any good or bad experiences with either?
Both may "be available", but if they look up the plugs specific for your car it should show the ones that are pre-gapped to 0.040".

Here's why:
http://www.acdelcotechconnect.com/pd..._03D-J-171.pdf
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