I was looking through some of my old stuff today and came across two sets of rocker arms that were numbered ECU 6564 A2, ECU 6564 B2, ECU 6576 A2, and ECU 6576 B2. So far, I haven't found what engine these are used on, what ratio they are, and if they would have any good use now. Each rocker also has either the letter L or R on the other side from the number. Does anyone have any information to share on just what these rockers are? They are a rebuilt set with bushings installed and the faces dressed with the arms painted a sort of gold color. Thanks for any help!