i have an 89 5 speed that i bought a reman motor from ford for. i took the heads off and had them ported, valve job, and double valve springs. i didnt change pushrods or valves. i bought the ford performance non adjustable roller rockers and put those on it. i made sure that all the valves were closed when i torqued them down. now when i first started the car, i could hear a valve clattering(or what sounded like a valve clattering anyway) on the drivers side. so i got the drivers side valve cover off and sure enough, one of the rocker arms was loose(third one from the rear of the motor). i took it off checked for any kind of wear or damage. there was none. i made sure the bolt hole that holds the rocker arm was clean. put it back together and retorqued it. started my car back up and the clattering was still there, but it was much quieter than before. so i took it apart again and im checking it right now and it isnt loose nor any of the others. i turned the motor and checked all of them and they are all tight. now i noticed that the rocker arms do move side to side a bit, and that makes a clattering sound. could this be what im hearing? if so why can i only hear it on the drivers side and not the passenger side? if any one has any suggestions please help!