Correct Markings for 1965 Engine Head Bolts

[Terry M.]

I'm looking for some feedback on the correct head markings for engine head bolts on a 1965 car. Mine is a fuelie but I doubt there was any difference from engine to engine. I found an old TDB post from Dec. 12, 2018 entitled "1964 327/375HP Correct Head Bolt Marking" that included some photos but I was not able to make out the markings. I have a set that I believe are original to my car that have an F on the heads. I also have a set with CP on the heads. There were a number of vendors that supplied these and it is entirely possible for an engine to have more than one type head mark on it due to this. Can anyone provide some input on what character(s) might be correct? Thanks.

[Michael M.]

Re: Correct Markings for 1965 Engine Head Bolts

I have seen many different bolt head markings. They include FP, M, F, TR, C, RSC, A, E, O, and FB. I am sure other head markings can be added to this list.