[70 Forest Green Zee]

Verne.....the gas cap was original to the car.....Camaros with the NA9 (Calf emissions)vented the gas tank all the way under the car to the front and into the charcoal canister. Only cars built to be sold in the state of CA were this way and that's why they all had a non vented gas caps. This Z28 was sold new in Alameda CA and the NA9 emission package was mandatory for all Camaros sold in CA. Hope this clears things up for you.