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1971 Engine Emission Control Information Labels

 

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1970

© ChevelleWorld
1971

© ChevelleWorld
1972

 

Engine emission control information labels are affixed to the radiator-support panel and provide specifics on some tune-up information such as ignition timing & dwell and idle RPM for a given engine regardless of transmission. By 1971 the emission labels confusion of the 1970 model year had calmed down and all four U.S. plants standardized on their label broadcast codes.

 

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If you have a build sheet for your Chevelle, the label is coded in box 91 like this Kansas City assembly plant with the LS5 engine regardless of transmission type.

 

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Label Broadcast Code Engine - Transmission
AO 307 - all
AP L65 - all
AQ L48 - all
AT LS3 - all
AU LS5 - all

 

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