[Charles]

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Mark, I picked up on an article over on CRG a year or so ago including some GM paperwork indicating that '68 cars built for Canada did not have A.I.R. and indicating the proper pipe plugs for the exhaust manifolds. Just prior to discovering that article, I had asked Jerry McNeish about it and he said that he had heard that Canadian '68s didn't have A.I.R., but had never been able to verify it. Who knows? Anyway, my '68 has what is almost certainly a '67 cowl plenum breather and I am going to leave it that way during restoration.

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Hello It is my understanding that Canadian 1968 Camaro Z/28 option models all had smog equipment. I was shown a picture from that period of a complete 1968 302 motor on a skid and the smog equipment was present there to.
One guy ordered a 1968 Camaro Z/28 with the factory GM headers. When the car arrived at the dealer the car had the smog equipment installed and the headers were stashed in the trunk. There was no fittings on the headers for smog equipment. GM considered the headers 'off road use only'parts. This is not 1967 related but the question did come up...