smog pump

It's probably from the same year as your car. Go to a junkyard and see if they have any 80 or 81 Chevy's you can pop the hood on.

I had the air pump check valve go bad on my '79 GTS and the check valve from my '82 Jeep CJ7 was a direct replacement.

 

The pump on my '79 308GT4 is a direct swap with a '78 Camaro, I believe.

 

Check A/C Delco Part Number 215143...

 

I had an '81 308GTSi for many years. When I first bought, the previous owner had removed the drive belt. I think the belief was that the pump consumed a few HP. With the belt removed, the exhaust backflowed into the pump, thus freezing it up. In my quest to meet emissions, I was told that the pump was a GM pump, but I decided to just take the frozen pump apart and clean it up inside. It worked like a champ ever since. I would try to clean the existing pump if you have it, first. E. Doug.

 

Any REAL auto parts store(non pep boys,etc) will have a catalog from pump rebuildersto I.D. the various G.M. type pumps,match and order.