[TXZS]

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.