Need to identify some Rocker Arms


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By Dennis K. - 15 Years Ago
These characters are on the following rocker arms, all are adjustable with an interference fit screw.  Can anyone ID them for year, application, ratio, etc ... ?

ECT-6576-A2, it also has an L on the opposite side.

ECT-6564-A2, it also has an R on the opposite side.

GA

GAB  

All these rocker arms are new, about 40 total.

Regards,

Dennis

By John Mummert - 15 Years Ago
The ECT rockers are from a Lincoln Y HD truck engine. L & R are Left and Right. Won't fit a Y-Block although shaft size is the same.