No luck Adjusting Rockers

Hey all, Motor: 71 340 J heads with hydralic cam & Speed pro adjustable roller rockers.
So i adjusted them with one full turn of preload.
They still chatter after running for a few minutes with great oil pressure 60-70 on start up and 25 and up when warm can i go more? should i go more? 1 1/2 ? 2 full turns?
Does this mean the cam is wiped out?
I just want the clatter to stop otherwise runs great!