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AC Delco Iridiums Gap????

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Old 04-18-2010, 07:02 PM
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Default AC Delco Iridiums Gap????
i just got my msd's and delco iridiums......they are supposed to be set at .40, but the sticker inside the engine bay says set gap to .60.....what do i do?
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Old 04-18-2010, 08:47 PM
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i use 60 myself
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Old 04-18-2010, 08:53 PM
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Don't try adjusting the gap on Iridium plugs, the center electrode is super fragile and not designed to be tweaked.
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Old 04-18-2010, 09:04 PM
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i have a jacobs ignition SP gapper..........not a cheap tool
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Old 04-19-2010, 01:35 AM
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Crap back under the car I go then. Just put in Bosch platinums and set the gap to 40 not 60. Autozone said to set to 40 and the car I bought had the sticker missing. Oh well should be easy to come out atleat now.
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Old 04-19-2010, 01:50 AM
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I gap my iridiums real gently to .04

Edit: I meant to put .04 not .4
Last edited by bene; 04-19-2010 at 02:24 AM.
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Old 04-19-2010, 02:02 AM
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GM revised the gap from .060 to .040 a few years ago.
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Old 04-19-2010, 11:02 PM
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thanks everybody.....i didn't mess with them.... i found an article talking about the above post......GM decided they run better at .040, so that's where i left them
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Old 04-20-2010, 12:38 PM
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Originally Posted by robsls1
Crap back under the car I go then. Just put in Bosch platinums and set the gap to 40 not 60. Autozone said to set to 40 and the car I bought had the sticker missing. Oh well should be easy to come out atleat now.
Get rid of the Bosch Platinums while you are in there!! Bosch plugs run like complete **** in these engines, they just aren't designed for them.

Get AC Delco Iridiums. You will be much better off, and the gap is pre-set.
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