Manufacturer: General Motors
Part # 12563707
Other Part # 41-974
These are new never fired spark plugs that will come in unmarked poly bags.
They were removed from a brand new crate engines which were modified for a high performance build. As a result, it no longer needed the OEM Factory Parts. OEM, Not a aftermarket replacement.
Please compare to your original to ensure this is the proper part you are needing.
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