Engine Ground Bolt
- Thread starter Kutthroat
- Start date
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SuperSpore
OBS Enthusiast
Are you “Nuts”?No! Fight me!
...I have no doubt it is. They look totally different.
SuperSpore
OBS Enthusiast
Mostly yes
HotWheelsBurban
Gotta have 4 doors..... Rawhide, TOTY 2023!
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.
evilunclegrimace
Does not always play well with others
I just went out to the shop, I have a '97 5.7 on the stand. That ground stud has 3/8x16 threads on both ends and takes a 9/16" wrench on both the stud and the nut. My '98 suburban has the uss and metric combo stud.
It’s like my distributor hold down nut. A friend who’s a semi-retired mechanic kept telling me it’s 1/2 and not 13mm. Finally, I told him to try his 1/2 Snap-On distributor wrench, nope, he couldn’t get it on. I handed him a 13mm. 
454cid
Sooper Pooper
I 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.
AuroraGirl
I'm Awesome
water pump and intake and a lot of internal fasteners of the 3800 are SAE
So 3/8 and 1/2 or else you will probably round the 3/8 for sure with a 10mm and probably make swiss-useable-cheese of the 1/2 bolts with a 13mm.
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