All three o mine(1980 c10, 1979 k10, 1976c10) have regular hex head bolts in them. On the 76, every bolt came out with no problems, on the 79, only the cab bolts came out in one piece, I got to the point where I tried to turn the ratchet as fast as I could to snap off the bolt. I have not torn into the 80 yet. I have to do a 2 inch body lift on the 79 as it now has the 76 body on it and the center hump is too short. Oh well, I measured and 2 inches will work perfectly to clear the transfer case.
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