Question about 1973 Explorer model valve covers. Met a fellow Bronco owner today who is looking for parts for a 1973 Explorer and he pointed out that the valve covers have Ford oval on them instead of Powered by Ford. I had never seen or noticed this but the below picture from a 1973 Explorer has the Ford oval. Anybody know why the difference or how long this version of the valve cover was used? My pretty original 1973 non explorer and my other 1973 both have Powered by Ford version. Thanks.