C7ZE-A HiPo heads

[Bossbill]

   Bill we are all good. My concern ( Maybe "I" need proof") is of a C5OE head on a '67 engine from the Cleveland engine plant. Maybe a 6L or M date code too.
   Randy

Randy -- Sorry for the confusion between us. I was trying to be clear and not to ruffle feathers and didn't succeed -- at all.

I've not see evidence of this on Hipo nor non-hipos delivered to states and regions that didn't require thermactor systems over 40 plus years

Jeff -- Evidence from the field is a very good metric. Thanks.

I'm still stuck on the C7ZE heads introduction to the production line. Jon (1175) hasn't seen any heads prior to December and 6M8 as the earliest date mentioned so far.
I finally found my DSO database and if we run that date through the database we find 171 GT350s with a Ford SJ build date before Dec. 8th. This is just a single data point with no definitive conclusion attached without more samples.

[gt350hr]

  The task is always tougher 50+ years after the fact!

[Bossbill]

  The task is always tougher 50+ years after the fact!

This is like an architectural dig -- using a Q-tip!