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Old 03-01-2011, 02:21 AM
Camou2 Camou2 is offline
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Join Date: Oct 2007
Location: Annapolis, MD
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Default Re: Header bolts - what type and size

I agree with H2Bill. If a mfg is building headers for an H2 then they should be able to answer your question. Unless you have a complete dealer service manual this info will be hard to find. You might try calling a local GM dealer who still services the Hummer brand and they should be able to find the answer.
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