I thought this was a rather strange find. While cleaning and preparing the FACTORY head bolts for re-installation, I found this! See the pic. The outer 3 bolts on each head, only the long ones are copper plated. So on each side there are 7 typical head bolts and 3 that are plated. This includes a couple stud bolts, one which has the negative battery cable attached to it. Has anyone ever seen this on any Pontiac engine? I have not that I recall. Is this an SD-455 thing? Kind of interesting at least. I am very confident these are the OE head bolts. All 20 have the same head markings. What do you think?
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