1970-79 GM Gas Cap - Factory Correct - used on all GM cars from Jan-1970 to around 1979. 1piece This gas cap issued on many GM cars from Jan 70-79 including , , , , , and just about every other model. There were a few different gas caps produced in this time period and this is one of the most . This is a vented cap that started when emissions started on Jan 1 1970 - so this cap and emissions started in CA in 1970 and the rest of the country, in the next model year that started in September 70 when they started to build the 71 cars. So all 71 cars had this cap and CA and select cars in 1970.r u