One Bad Duramax

I'm hoping one of you can tell me the size of the breather hole GMPP valve covers 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.

toytech93

iTrader: (2)

1.22"