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Re: Hinge bolt length
The original door bolts off my 1971 are (GR 5) recessed hex bolts with spin washers. The bolt threads are 3/8-24 x 1.1/8". They're stamped double F.
You can buy black oxide replacement bolts off Ebay, and they're expensive. They claim they have the correct markings, but no, they just have three slashes for grade 5. They're shorter than original, maybe 1" long, but should work.
The hood hinge bolts off the same truck are (GR 5) recessed hex, tapered end bolts with spin washers. The bolt threads are 3/8-16 x 7/8. They're stamped "ELH" or "E".
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Tony
71 Custom Deluxe, SWB, 2WD, 402, A/C.
I developed an assembly guide (kit) for restoring this truck from the ground up, complete with details including full hardware descriptions. Much of the info. applies to all 67-72 GM. My build thread, with some info. about the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025
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