Putting a set of heads on my stang they come with adjustable guide plates and i bought some scorion rockers first off what is the best way to adjust the guide plates? Also i put the rockers on and adjusted them the way i was told wait till exhaust valve opens a little bit spin push rod while tightening bolt get to the point of no lash turn bolt half a turn... When i did this i noticed as i was going to adjust other rockers that i could wiggle the already set rockers a little bit is this normal? And these are not the pedestal rocker arms any info would help thanks....
Rocker arm and guideplate questions
- Thread starter KrazZ27
- Start date
R.J.
Member
This method of adjusting rockers will guarantee that the cam lobe of the cylinder that is being adjusted is at its lowest point.
With the piston at TDC, with both valves in the closed position, do the following:
The first thing you want to do is verify zero valve lash. The best way to do this is to wiggle the push rod up & down as you tighten the rocker arm nut. At the point where the push rod no longer moves up & down, That is zero lash. You now have a starting point for verifying “true” zero lash & the lifter pre-load.
When you adjust the valves you are setting the lifter pre-load, Pre-load is the amount of distance the push rod seat (or “cup”) moves away from the retaining clip.
To set true zero lash & the lifter pre-load, We are going to follow the “EO / IC” procedure.
What is “EO / IC?
EO, is Exhaust Opening; IC, is Intake Closing.
We have the piston at TDC (Both valves are in the closed position), Rotate the engine in the normal direction of rotation (clockwise, if you are facing the front of the engine).
You will see the exhaust valve just starting to open, stop rotating the engine & back off the intake rocker arm.(You are going to back off the rocker arm & re-verify for true zero lash, As you are now positively on the base circle of the camshaft whereas the previous lash adjustment was just a pretty close ballpark guess.) You will once again wiggle the push rod up & down as you tighten the rocker arm nut. When all up & down movement is gone, tighten the rocker arm nut ½ turn, tighten the hex head set screw until it bottoms out on the rocker stud, tighten the rocker arm nut ¼ additional turn. You have now set the lifter pre-load at .045”.
Rotate the engine, You will see the exhaust valve fully open & then close. Watching the intake valve that you just set, You will see it open, You want to keep rotating the engine until it fully opens & then starts to close. When it is almost closed, stop rotating the engine. Set the exhaust valve the same way you did the intake valve.
Move onto the next cylinder in the firing order…
If you can move the pushrods after they are adjusted then the lifters are not pumped up. Turn the engine over a couple of time before you adjust and your adjustment should be pushing on a pumped lifter.
With the piston at TDC, with both valves in the closed position, do the following:
The first thing you want to do is verify zero valve lash. The best way to do this is to wiggle the push rod up & down as you tighten the rocker arm nut. At the point where the push rod no longer moves up & down, That is zero lash. You now have a starting point for verifying “true” zero lash & the lifter pre-load.
When you adjust the valves you are setting the lifter pre-load, Pre-load is the amount of distance the push rod seat (or “cup”) moves away from the retaining clip.
To set true zero lash & the lifter pre-load, We are going to follow the “EO / IC” procedure.
What is “EO / IC?
EO, is Exhaust Opening; IC, is Intake Closing.
We have the piston at TDC (Both valves are in the closed position), Rotate the engine in the normal direction of rotation (clockwise, if you are facing the front of the engine).
You will see the exhaust valve just starting to open, stop rotating the engine & back off the intake rocker arm.(You are going to back off the rocker arm & re-verify for true zero lash, As you are now positively on the base circle of the camshaft whereas the previous lash adjustment was just a pretty close ballpark guess.) You will once again wiggle the push rod up & down as you tighten the rocker arm nut. When all up & down movement is gone, tighten the rocker arm nut ½ turn, tighten the hex head set screw until it bottoms out on the rocker stud, tighten the rocker arm nut ¼ additional turn. You have now set the lifter pre-load at .045”.
Rotate the engine, You will see the exhaust valve fully open & then close. Watching the intake valve that you just set, You will see it open, You want to keep rotating the engine until it fully opens & then starts to close. When it is almost closed, stop rotating the engine. Set the exhaust valve the same way you did the intake valve.
Move onto the next cylinder in the firing order…
If you can move the pushrods after they are adjusted then the lifters are not pumped up. Turn the engine over a couple of time before you adjust and your adjustment should be pushing on a pumped lifter.
Maybe we can get a Mod to Sticky that incase anyone else needs it 
