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[Z06] Cylinder head question

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Old 04-18-2014, 09:37 PM
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Default Cylinder head question
Can someone tell me if these numbers off of these heads are stock ?
and how they are read

gm12578449 2103118 8452

Any info appreciated
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Old 04-19-2014, 09:24 AM
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RFZ
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first is gm part number, not sure about second, third is casting number, they are ls7 heads
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