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Iridium spark plugs

This is a discussion on Iridium spark plugs within the General Help forums, part of the LSx Technical Help Section category; hi is anyone here running the AC delco iridium spark plug i know they come gap at 040 do we ...

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    Iridium spark plugs

    hi is anyone here running the AC delco iridium spark plug i know they come gap at 040 do we have to change the gap or not and what gap do our cars use im basically stock
    Thanks

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    Should be fine. I think stock gap is like 0.44. My NKG's came pre gaped and I delcos should be the same.

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    Quote Originally Posted by fastbuff View Post
    hi is anyone here running the AC delco iridium spark plug i know they come gap at 040 do we have to change the gap or not and what gap do our cars use im basically stock
    Thanks
    you know...i have the same plugs and changed it to the stock .060 gap...wonder of that's why my power is down. i don't know shit about spark

    what happens when the gap is too wide?
    95 Exploder

    01 R1 coming?

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    Hey i just got an e mail from AC delco and they told me not to change the gap on the spark plugs

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    Member Fedge's Avatar
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    Quote Originally Posted by fastbuff View Post
    Hey i just got an e mail from AC delco and they told me not to change the gap on the spark plugs
    oh crap. wonder why they tell you on teh box to follow factory specs?????? ugh. changing the plugs is a bitch in these things and i did them when the motor was out of the car!

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    just got off the phone with them. I'm NOT happy at all. now i hafta regap all of my plugs. crap. they need to change the directions on the effing package from 'follow factory specs' to DO NOT GAP

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    Senior Member Too Fast's Avatar
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    Correct. Iridium or platinum plugs should never be re-gapped. Just inspect them to make sure they have not been damaged on the electrode end during handling.

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    Quote Originally Posted by Too Fast View Post
    Correct. Iridium or platinum plugs should never be re-gapped. Just inspect them to make sure they have not been damaged on the electrode end during handling.
    it still bothers me that right on the box it said to gap to factory specs, but then contradict themselves by telling me to keep it at the pre-set gap. well, that was a 60 dollar lesson learned. i pulled a plug and it was ooglay. I'm just gonna put the Delco Plats in there and call it a day...till I go FI

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    I'm not a big fan of Iridium plugs, I still prefer the AC 41-9xx series properly gapped or, if you're highly modified, these engines do tend to like Autolite plugs.

    Somewhere I have a reference to the AC heat ranges, if I recall it goes like this:

    41-921 = 4
    41-932 = 3
    41-919 = 2-1/2
    41-913 = 2

    The numbers have changed on some of these but they can still be found if you call around. The 41-932 are a good all-around plug set at 0.060

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    thanks for the info...i'll pick up the 41-932s Friday morning

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    Quote Originally Posted by Steve Crowe View Post
    I'm not a big fan of Iridium plugs, I still prefer the AC 41-9xx series properly gapped or, if you're highly modified, these engines do tend to like Autolite plugs.

    Somewhere I have a reference to the AC heat ranges, if I recall it goes like this:

    41-921 = 4
    41-932 = 3
    41-919 = 2-1/2
    41-913 = 2

    The numbers have changed on some of these but they can still be found if you call around. The 41-932 are a good all-around plug set at 0.060
    colder steps ?

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    Yes, on GM #s the lower is the colder, in other words I wouldn't run 41-913 in your engine unless you really push it on a regular basis.

    The 41-932 is similar in heat range to an NGK TR5 but it has a wider "cleaning range" so it tends not to foul out if you end up driving in a lot of heavy traffic, likewise it'll put up with spirited driving.

    I'll find that chart when I get time, kind of interesting. Matter of fact there's an entire discussion on this one of my past partner's worked up on plugs, you'd be surprised at how poor some are and how bad some cross references tend to be.

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