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GM had carlines arranged in groups back then - I think CPC stood for Chevrolet, Pontiac and Cadillac (?).

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Chevrolet - Pontiac - Canada

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At first I thought those might have been the cars on the ZR-1 european press junket, but those were 1989's, weren't they?

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30003 Van Dyke in Warren is the General Motors Technical Center. Sounds like a rare car, but then all ZR-1's are.

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The CPC Group is at the GM Tech Center in Warren, Michigan. Its on Van Dyke.
Test track is there too.

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The CPC Group is no longer. We are now comprised of much more corporate oriented groups.

The test tracks are located at the Milford Proving Grounds.

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This forum is great. Thank you all for the continuing information.

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Of course, Pontiac doesn't exist any longer, and u now have GM Powertrain, but was there not a testing facility at Warren? I realize Milford is a different facility, but it looked as if there was some very high fencing at Warren that looked to hide some track testing facilities. This is in the mid 2000's altho looking at Google Maps, there appears not to be.
I worked for a company out of Warren and would stay at the Marriot across Van Dyke.

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My 1990 z #2441 has the original window sticker showing delivery to warren Michigan the proving ground; but when I ordered a second copy from NCM shows it shows delivery to Champion Chevrolet in Manhatton Beach, California. The car was sold from that dealership. I don't understand why the original window sticker says warren Michigan delivery and repo says Manhatten Beach CA???? So the repo sticker is correct because I have paper and salesman cards from Champion Chevrolet in CA. And yes both window stickers are for car 2441. Any ideas out there?

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It was an executive use car before being released for sale!
My 96 was an executive use car before I Bought it!