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No! Fight me!The nut to remove mine on a Vortec was definitely a 13mm.
Are you “Nuts”?No! Fight me!
...I have no doubt it is. They look totally different.
Mostly yesAre you “Nuts”?
Mine is Uncrustable.A mm isn't much. If the head is crusty I can see it needing a one step up size.... BTDT a few times myself.
My '98 suburban has the uss and metric combo stud.
water pump and intake and a lot of internal fasteners of the 3800 are SAEI believe my (99 454) fan clutch studs are like that, although, I don't know the sizes. I was going to try to replace them, last time I had it apart, and all I could find was SAE that would be for your standard SBC of years past.