41-101 - Iridium Spark Plug For 8.1L & 7.4L

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41-101 - Iridium Spark Plug For 8.1L & 7.4L

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I'm unsure what to do about the GAP on the 41-101. I'm installing the kit on my vortec 8.1, it seems like you recommending I gap the plugs to .045? Is that right? I want the best performance, of course. ( Harold Tomlinson, 03/01/2023 )

Hello Harold, the Iridium spark plugs (41-101) should come pre-gapped to 0.060 , and are not recommended to be "gapped" any tighter . ( Support )

My GM 8.1L Vortec is from 2002. Are these plugs generic for all years of the GM 8.1L? ( Jeffery Howland, 12/28/2020 )

Yes, we use this part # in all year models of the 8.1L. ( Support )

Have a 8100 vortec with banks headers, cai, exhaust. Are the 41-101 plugs right for this? ( Kenneth Ruedinger, 07/31/2018 )

Yes those are the correct spark plugs for your application. They come pre-gapped at .060 but a lot of people have seen an improvement by reducing the gap to .045. ( Support )

Will a ac delco 41-101 work in my 8.1 vortec workhorse w22 ( Roy McBride, 11/02/2017 )

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VIN Verification Service Item

This product allows for a VIN verification service.

VIN part verificaion is a service that we provide free of charge when a part is purchased.
When you provide your VIN below we will personally verify your part selection by your VIN before shipment of your order.
This helps ensure that this is the correct part for your vehicle.
This is not an automatic VIN check, it is done by a parts specialist once order is placed.
We can only VIN verify vehicles back to model year 1996, if older we can help but can't guarantee fitment.
If you would like to have your part selection verified before purchase please call or email us.