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AC Delco Iridiums Gap????

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Old Apr 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 Apr 18, 2010 | 08:47 PM
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i use 60 myself
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Old Apr 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 Apr 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 Apr 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 Apr 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; Apr 19, 2010 at 02:24 AM.
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Old Apr 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 Apr 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 Apr 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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