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I'm hoping one of you can tell me the size of the breather hole GMPP valve covers makes vs stock LS7 covers.
Reason: I have a GZ Vacuum pump wanna make sure I can tig weld that to this cover easy . Or I'll order or make something else. I'm in a tight dead line . Corvette Magazine is shooting my car next weekend.
It's supposed to be 1.25" as mentioned but for some reason I have it written down as 1.210" which is what I think I measured it at a long time ago. The hole is the only thing that sucks about those covers. but if you're planning on TIG'ing over it then no worries. Although you'll have to powdercoat or something afterwards. That's what I did.
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Gmpp ls valve covers 
