GMT 800 & Older GM General Discussion 2006 & Older Trucks | General Discussion

16 didgit number engraved into both heads

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Old Nov 21, 2011 | 12:45 PM
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50kta's Avatar
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Default 16 didgit number engraved into both heads

i noticed when tearing down the heads on the 5.3 there are 16 didgit numbers engraved into each one? the number is 0004201743029864 what is it and is it important?
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Old Nov 25, 2011 | 05:23 AM
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03 BLACKOUTSSS's Avatar
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probably just a serial # of sorts. No.
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