Topic: OK Stamp - 69 351W?

[HeavyMetal69]

Was the yellow OK stamp found on either drivers or passenger side of the front of the valve cover?
Thanks

[Bob Gaines]

Was the yellow OK stamp found on either drivers or passenger side of the front of the valve cover?
Thanks

I have typically seen the OK stamp on the drivers side valve cover.

[HeavyMetal69]

Me as well but since I installed A/C, not much room to add it. Hoping it was on the pass. side as well as there is plenty of room to stamp it.

[J_Speegle]

Me as well but since I installed A/C, not much room to add it. Hoping it was on the pass. side as well as there is plenty of room to stamp it.

Looks like they were often applied to the drivers side valve cover on a Mustang and other cars without cast aluminum (non- Shelby) valve covers. Has also been found on the front head surface just below the valve cover near the inspector stamp. AC pumps were not in place so pretty easy to add originally. There are at least four if not more different sized and styles of the OK stamp. With and without box around letters, dash and no dash plus multiple overall size are some differences.  It appears that they differed between engine plants and even individual inspectors.

Often allot of the stamp is covered over by the engine ID label

One example