Mike:

Even after replacement with new hydraulic compensators (aka, "lifters") there exists the possibility that one or more of them may be leaking internally. There is also the chance that, due to manufacturing tolerances, a compensator is at the end of its travel. There is a procedure for checking and adjusting the initial position of the compensator plunger that can be found in the Service Manuals. It involves the thickness of the distance piece, which is a shim in effect, that sits in the valve spring retainer between the tip of the cam follower and the end of the valve.

Addendum: All aluminum block (and some iron block) M116/117 engines were equipped with hydraulic compensators. Ergo, 1984, being an aluminum block engine, is of the hydraulic type. The shim mentioned above is also known as a "lash cap", although in this application it serves to set the initial geometry of the compensator/cam follower/valve tip.