No Challenger or Cuda ever came with a vented cap, none. Matter of fact no mopar came with a vented cap after 1970. They were all vented through other means.
Hmmmmmm, check your parts book before making such comments: 3404 668(on the original box) Fuel Tank Locking Cap(Vented). I have an NOS locking gas cap for my 1971 Challenger, which is what it and ALL other 1971 Challengers came with, if the cap was locking. 14-86-47, the part number there is 3404 667. The book says 1970 with ECS and all 1971 J cars.
