The whole thing with POCI admitting GMC owners goes back to the last half of 1950s, when GMC used Pontiac engines. Owners of those trucks had a legitimate reason to be interested in joining the club, and then I think the club officers decided to open it up to all GMC years in order to increase membership. Also, it was common back in the day for Pontiac dealerships to also sell GMC trucks, so that was another connection (I think every Pontiac dealer in my area when I was a kid sold them). I didn't think it was that big a deal and in the end, I don't think there were that many GMC owners who did sign up - I can only remember seeing one or two of them at shows.
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