1968 Z/28, SS350 Valve Covers [Archive]

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scuncio

12-08-2019, 11:16 PM

Hi folks,

Trying to figure out if these are GM or reproduction. I have had them for years - they came with other '68 302 parts so I assumed they were originals, but they don't have the 'O' stamped into the flanges. Thoughts?

https://photos.smugmug.com/SYc-Site/i-tCxdzNg/0/2bb9c182/X2/1C5A7D72-F334-4C5E-9D54-5FAC895A30A9-X2.jpg

https://photos.smugmug.com/SYc-Site/i-K7tTZDz/0/c3d8ea40/X2/1D34B4B5-7F28-4A0F-8182-91C54B582314-X2.jpg

https://photos.smugmug.com/SYc-Site/i-xCf9fNv/0/61d23fd7/X2/D8545BFE-6EA9-4DD6-8DB3-F9E6C50FA4F3-X2.jpg

https://photos.smugmug.com/SYc-Site/i-MqvndM5/1/0be1d282/X2/3A0D38D2-511D-4BB1-8AC8-0C4DBF17CFCF-X2.jpg

Motorhead848

12-08-2019, 11:30 PM

Wasn’t the “o” only an assembly line inspection marking?and I think service replacement parts don’t have it.

scuncio

12-08-2019, 11:46 PM

Ah, that would make sense! Appreciate the guidance.

Canuck

12-09-2019, 12:34 AM

Motorhead 848 is correct. I had an NOS set, no stamp.

scuncio

12-09-2019, 12:56 AM

Thanks!

300deluxeL79

12-09-2019, 01:43 PM

these were also used on the '68 L79s

Jonesy

12-09-2019, 08:58 PM

I have a used set that I could take pics of to show for comparison.

scuncio

12-10-2019, 02:44 AM

Thanks guys, I have another set that came with my '68 Z28 which have the 'O' stamped on the flange. I was confused as to why these didn't....

Appreciate the help.

AnthonyS

12-10-2019, 03:40 AM

I have heard that the "O" was a locating mark for the assemblers - that those marks are supposed be on the intake side when installed; if you look closely the covers are longer / taller on one side for rocker arm clearance and we've all seen the marks made on the inside when they're installed backwards, and likely heard the difference too. Cheers.