Restoring - General discussions that span across many different groups of years and models > Drivetrain

"SPEC" instead of date code on exhaust manifold?

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C9ZZ-16228-B:
What would be the meaning of "SPEC" where the date code would normally be on a C6OE-9430-A 390GT exhaust manifold?  Is it an early prototype thing or a does it denote "special" for a special application?  Or something completely different?

thanks,
Garrett

J_Speegle:
Have seen it on other exhaust manifold (same application you listed) and believe its not related to any prototype or experimental purposes or we would not find the same markings on 67 Shelby third member casings. They may have had some purpose originally and then things changed and they made their way into production usage

Never saw any differences in the exhaust manifolds and dated ones that I've seen but they make good conversation pieces. We may never find out who and why

C9ZZ-16228-B:
Thanks Jeff.
Would it be acceptable to use on a '67 GT500 in Concours judging?

J_Speegle:

--- Quote from: C9ZZ-16228-B on October 20, 2017, 03:57:18 PM ---Thanks Jeff.
Would it be acceptable to use on a '67 GT500 in Concours judging?

--- End quote ---

Since, in Councors Trailered and Driven sort of classes, we're not focusing on date codes I would guess it would ignored on an early car but if noticed would likely take the team off track and create a bit of a discussion  :)  I'm guessing you have only one. Might it be a passenger side?

C9ZZ-16228-B:
yep, its a 9430 so its the RH manifold.  I don't remember seeing a SPEC left, but i'll take another look.

thanks again for the info!

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