I have seen the EUN on the PHS on 1964 GTOs only on the Fremont built cars not any other plant. I have two April built Fremont cars and they both have the EUN on them, My Pontiac built cars do not have the EUN on the PHS. I would not consider April built cars early build. Have never seen EUN on any PHS in 1965 or 1966 for that matter! Cant explain why Fremont cars in 1964 have the EUN and other plants did not. THANKS!
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