IMO this decal is similar to the ubiquitous 400-4 decals we see on air cleaners. Highly unlikely this was ever a factory decal.
Agree with the tarco and “the legendary” comments.
And where did this “MARK V” reference come from? Have never seen any Pontiac literature mention MARK anything.
However, I do recall talking to an oldtimer about the tarco reference many years ago and he said tarco was involved in developing the valvetrain. I do not consider the source reliable.
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