Run the engine until it reaches operating temperature. Remove one valve cover. Use a socket wrench . There are gizmos that you can put on the end of the rocket arms to help with the mess. start the engine. Loosen one rocker stud nut until it clatters. Slowly tighten the stud until the clatter stops. Now tighten the stud nut. 3/4 turn 1/4 turn at a time. repeat this for the rest of the rocker arms. Replace the cover and repeat on the other side. Expect a mess.
Most 350's I know of have hydraulic lifters. You don't adjust them. take the valve cover off get some thing to put on the side of the head so no oil splashes on everything start the engine loosen one rocker till it rattles the tighten till it stops rattling and go 1/4 turn after that then do the rest same way
Any under the hood components will have to be moved to gain access to the valve covers. Remove the covers. The rocker arms are held in by one nut per each rocker. The rockers need to be unbolted, removed, and the push rods inspected. the arms need to be set to the gap desired, depending on how the engine will be used. Reassemble the parts on the engine.
The process is quite simple but you shouldn't just adjust one. They all work together and should all be adjusted when they are gpoing to be done. Engine has to be set at TDC. There are specs involved in the proper push rod to rocker distance. Best left to a qualified mechanic that knows the process.
If it's actually the rockers arms that are "chattering" while the engine runs, you may need to adjust the lash. If there are Solid lifters in the engine, you may want to switch to hydraulic lifters and adjust the rockers to the moment of "zero lash". Adjust them in pairs per cylinder while the lifters are in the down position (both valves closed). When you reach zero lash on the rocker arm (the pushrod will suddenly stop spinning freely in your fingers) add an additional quarter turn to the rocker arm nut to set the "pre-load" of the lifter. This just means that the pushrod will be pushed down slightly in the spring loaded hydraulic lifter and when the engine runs, the oil pressure will keep pressure on the lifter and thus the rocker arms will run silently. More detailed info at BoxWrench.net if you need it...
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