Emissions Control System ID help, 1971 Duster 340

My 71 Demon 340 was ordered in March 1971 and delivered in the Cleveland, Ohio, area on May 7, 1971. It does NOT have N95 on the VIN tag but it DOES have the vent standpipe in the trunk as shown in the pic (little hard to see in black). With this vent pipe, you also got the 4-vent line tank (although either the 4-vent or the single-vent tank can be used with it!).

I do not claim to know why they used these or not but it was one way of containing tank vapors and sending to engine instead of atmosphere.


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