We have emission testing in this province, even for vintage vehicles. When I took my Dodge M152 (flathead Chrysler 6 cylinder) through the first time it failed. I didn't really expect it to pass but I wanted a baseline. After a valve cleaning and new head gasket it passed with about 30% of the maximum allowable emissions.
The idle test results were 314 out of 972 ppm for hydrocarbons and 2.26% for CO with a maximum allowed of 4.90%. NOx was never measured.
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