Back in 1983 I bought GM 68 z28 valve covers,they are new in the original boxes and I noticed some that are on ebay have the O stamping on them.My covers that I bought from my local chevy dealer in 1983 do not have that O stamping.Was that a factory stamping only and not a part stamping? ???
Careful with "NOS" '68 Z/28 rocker covers. At some point Chevy substituted chromed '69 covers, one of which has an oil fill cap.
I just checked the original valve covers on my '68 Z/28; both of them have the "O" stamped in the center of the top sealing flange. :)
Paul
Jerry do you know anything about this O thingy LOL. Why a nos part would not have a O stamping? Also these do not have the oil fill hole.here are the pics
the boxes
(http://i96.photobucket.com/albums/l188/Budbrewer1/IMG_0707.jpg)
the covers
(http://i96.photobucket.com/albums/l188/Budbrewer1/IMG_0708.jpg)
underside
(http://i96.photobucket.com/albums/l188/Budbrewer1/IMG_0709.jpg)
http://www.camaros.org/forum/index.php?topic=5741.0
See post #2 by JohnZ