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sting ya

04-18-2014 09:37 PM

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

RFZ	04-19-2014 09:24 AM

first is gm part number, not sure about second, third is casting number, they are ls7 heads

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