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post #1 of 5 Old 05-04-2014, 04:42 PM Thread Starter
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Spark plug question...

I've got a 347 with Dart aluminum heads and a turbo. I've just recently converted from my MSD with a single coil to MS3-Pro coil on plug using the LS truck coils. The question that just occurred to me, should I change from the standard plugs to iridium ones? I know that my GM V6 ran like crap with conventional plugs (I tried to cheap out on a tune up) and I had to change back to the iridium ones. Would that be based on the coils being used, or the ignition, or does it have something to do with chamber design? I know that the iriduims are supposed to last longer, but had I not tried the standard ones in that Impala I never would have realized the difference. I'd love to hear from people that have had experience with this in a semi-drag car.

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post #2 of 5 Old 05-07-2014, 03:41 PM
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I'm not running a turbo but I run a 393 with those coils and I'm using standard plugs. I don't see any reason to change them.


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post #3 of 5 Old 05-13-2014, 09:11 AM
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Ive just been running 3923's with the ls coils, i am going to try NGK's this season though. No drivability problems to speak of, but if you do try it post your results here, id be curious to know if it makes any difference.

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post #4 of 5 Old 05-13-2014, 11:51 AM Thread Starter
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I've been running the NGK's up until now. I was just wondering if there was an iridium requirement with the LS coils. Sounds like that is not the case from the responses. I will probably just stick with what I have for now.
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post #5 of 5 Old 05-13-2014, 02:52 PM
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Quote:
Originally Posted by MNtony View Post
I've been running the NGK's up until now. I was just wondering if there was an iridium requirement with the LS coils. Sounds like that is not the case from the responses. I will probably just stick with what I have for now.
The iridium plugs are more of a longevity thing than anything else, so they can advertise 80,000+ mile spark plug replacement intervals.

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