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Old 10-21-2020, 12:12 PM
RA1John RA1John is offline
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Default Valve Cover Bolt Head Markings & Finish

After doing some research, it would seem that valve cover bolts used from '64-'68 were black (phosphate, zinc or cadmium?) where as '69+ were silver zinc or cadmium.

Going through my fastener stash from various projects & parts cars over the years, I've come up with a few variations. Would be curious to see pix of original restored or survivor assembly line bolts.


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Old 10-21-2020, 12:20 PM
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rare4k rare4k is offline
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I believe the 65 used the letter P

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Old 10-26-2020, 01:36 AM
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4zpeed 4zpeed is offline
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1968 GTO in original form, posted by '68gtoMN'.



Looks like the (D) marking to me. Check this link for finishes also. http://forums.maxperformanceinc.com/...d.php?t=844637


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