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what do you want to know about it?
its not stock. any gt40 spacer works, most guys run them when they want to put aftermarket valve covers on the truck.
^ Agreed. They're mainly used to gain a little extra clearance between the upper and lower intakes so taller valve covers may be used. However, the hot exhaust gases may burn a hole through it, over time, if the EGR port in the lower intake hasn't been plugged.