I decided to adjust the valves on my '56 TBird today.  The best I can determine from the receipts is that the engine was gone through in 2005, and driven very little since then.  The valves were in pretty good adjustment, and only minor tweaks to get them to the recommended .019".  They have the interference fit screw adjusters on them, and not the locknut type. 

What surprised me is there are no markings on the rocker arms whatsoever.  I know there were 1.43 and 1.54 ratio rockers available for these Y-blocks, and the ones I had seen previously had identifying numbers, such as 5751066, or ECG6564-B2.  

Does anyone have any comments on unmarked rockers, are they common, and what might I have?  

Thanks, Ralph