Quote:
Originally Posted by CCAR
Thanks for taking the time to post that, you must be part of the old guard : ) I was interested in the markings on the bolts, restoring a very original old truck.
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Here's one of the bolts from the hub on my truck, it's a 66 K20. Head marking are standard, I think the CP is the manufacturer. Numbers IDR, perhaps a date code. The radial lines indicate its a Grade 8 Bolt. I have some reference documents on bolt head markings and will dig them up if you wish. Send me a DM...