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Old 12-20-2004, 05:37 PM   #2
gmc67swb
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Join Date: Feb 2003
Location: Mesquite, Tx
Posts: 396
Not sure on casting numbers, but they were standard issue on 96-98 trucks. You may need guided rockers as well. I'm using headers with mine, but I'm pretty sure your manifolds will bolt up.
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