LS1 Help!!!
The lifters are hydraulic. No adjustment. I would stay away from 1.8 rockers. If your looking to get rid of some valve train noise get a adjustable push rod length checker and get a exact push rod length for your application.
Thread Starter
Registered User
Joined: Sep 2008
Posts: 12
Likes: 0
Ive never had any problems with noise with them so far, just changed the springs and ive never adjusted valves on a LS1 just older SBC engines...But I found what I needed thanks:
IMPORTANT LS1 VALVE ADJUSTING TIPS
When adjusting the lifter preload on a hydraulic roller camshaft,
special care must be taken to account for lifter bleed down. Install
the rocker arms on the studs and tighten the adjusting nuts to
achieve zero lash (with no preload and no pressure on the valves).
Be sure the setscrew in the adjusting nut does not contact the stud.
Now, rotate the crankshaft one full turn and adjust any loose rocker
arms to zero lash. Rotate crankshaft again one full turn and
adjust any loose rocker arms to zero lash.
Do not rotate the crankshaft during the remaining procedure.
Allow lifters to bleed down for 30 minutes. Adjust any loose rocker
arms to zero lash. Now, tighten each rocker arm adjusting nut
¼ turn. Allow the lifters to bleed down for 15 minutes. Repeat this
procedure seven more times for a total of two full turns. Be sure to
allow 15 minutes bleed down time after each ¼ turn.
The lifters now have the proper preload. While holding the adjusting
nut with a wrench, carefully tighten the setscrew in the adjusting
nut of each rocker arm. Do not rotate the nut during this
process. Allow another 30 minutes bleed down time for this final
setting.
IMPORTANT LS1 VALVE ADJUSTING TIPS
When adjusting the lifter preload on a hydraulic roller camshaft,
special care must be taken to account for lifter bleed down. Install
the rocker arms on the studs and tighten the adjusting nuts to
achieve zero lash (with no preload and no pressure on the valves).
Be sure the setscrew in the adjusting nut does not contact the stud.
Now, rotate the crankshaft one full turn and adjust any loose rocker
arms to zero lash. Rotate crankshaft again one full turn and
adjust any loose rocker arms to zero lash.
Do not rotate the crankshaft during the remaining procedure.
Allow lifters to bleed down for 30 minutes. Adjust any loose rocker
arms to zero lash. Now, tighten each rocker arm adjusting nut
¼ turn. Allow the lifters to bleed down for 15 minutes. Repeat this
procedure seven more times for a total of two full turns. Be sure to
allow 15 minutes bleed down time after each ¼ turn.
The lifters now have the proper preload. While holding the adjusting
nut with a wrench, carefully tighten the setscrew in the adjusting
nut of each rocker arm. Do not rotate the nut during this
process. Allow another 30 minutes bleed down time for this final
setting.
