Finned aluminum Ford cast valve covers for any 1970-71 Ford or Mercury with 429CJ engine. Correct on 1971 Mercury Cougar and Ford Mustang with N or C code 429CJ engines. 1971, the passenger side cover does have a round hole for the PCV grommet and have a D1OE-6583-CA casting number.
Technically, for 1971, the passenger side cover would have a round hole for the PCV grommet and have a D1OE-6583-CA casting number.