heres how to adjust roller rockers on your small block chevy
Now it is time to adjust your rockers. You will need to be able to turn the crank (in the clockwise direction) to do these adjustments. Turn the crankshaft until the cast arrow on the crankshaft hub is in the 12 o’ clock position and number 1 cylinder is at TDC. Watch number 1 cylinder valves as the crankshaft hub arrow approaches 12 o’ clock position. If a rocker moves as the arrow moves to position, the engine is in the number 6 firing position. The crankshaft must then be turned one more time to reach cylinder number 1 firing position.
At this position, exhaust rockers 1, 3, 4, and 8 can be adjusted as can intake rockers 1, 2, 5, and 7.
exh rockers labeled in green
While spinning the pushrod with your fingertips, tighten the rocker down until you feel resistance in the pushrod - this is zero lash. Tighten the adjusting nut on the rocker arm an additional 1/2 - 1 turn (or whatever you think is right).
Turn the crank 360 degrees (clockwise) until the crankshaft hub is at 12 o’ clock again.
Adjust exhaust rocker 2, 5, 6, and 7 and intake rockers 3, 4, 6, and 8 as you did in the step above.
to tell what rocker is what, it to line up the rocker with the exh port on the headders, or manifold
VALVE LASH SETTINGS
Follow cam manufacturer guidelines. Each application will vary.
Hydraulic cams with stock rocker arms normally require 1 full turn tighter from zero lash (no clatter).
Roller rocker arms should be tightened no more than ½ turn from zero lash.