How do you adjust the roker arms on a Chevy Beretta?

To adjust the rocker arms on a Chevy Beretta, first ensure the engine is cold and remove the valve cover. Then, rotate the crankshaft to bring the piston of the cylinder you're adjusting to the top of its compression stroke. Loosen the adjustment nut on the rocker arm, then turn the adjusting screw until there's no play in the pushrod, and secure it by tightening the nut. Repeat for each rocker arm as necessary, and reassemble the valve cover when finished.