Chevrolet Full-size Cars 1968-1978 Repair Guide

Adjustment

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SOLID LIFTERS



1968-71 Vehicles

Before adjusting solid lifters, thoroughly warm the engine. The solid lifters are generally found on certain early model high-performance engines.

ENGINE RUNNING
  1. Run the engine to reach normal operating temperature.
  2.  
  3. Remove the valve covers and gaskets by tapping the end of the cover rearward. Do not attempt to pry the cover off.
  4.  
  5. To avoid being splashed with hot oil, use oil deflector clips. Place one in each oil hole in the rocker arm.
  6.  
  7. Measure between the rocker arm and the valve stem with a flat feeler gauge, then adjust the rocker arm stud nut until clearance agrees with the specification in the chart.
  8.  
  9. After adjusting all the valves, stop the engine, clean the gasket surfaces, and install the valve covers with new gaskets.
  10.  

ENGINE NOT RUNNING

These are initial adjustments usually required after assembling an engine or doing a valve job. They should be followed up by an adjustment with the engine running as described above.

  1. Set the engine to the No. 1 firing position.
  2.  
  3. Adjust the clearance between the valve stems and the rocker arms with a feeler gauge. Check the chart for the proper clearance. Adjust the following valves in the No. 1 firing position: Intake No. 2, 7, Exhaust No. 4, 8.
  4.  
  5. Turn the crankshaft 1 / 2 revolution clockwise. Adjust the following valves: Intake no. 1, 8, Exhaust No. 3, 6.
  6.  
  7. Turn the crankshaft 1 / 2 revolution clockwise to No. 6 firing position. Adjust the following valves in the No. 6 firing position: Intake No. 3, 4, Exhaust No. 5, 7.
  8.  
  9. Turn the crankshaft 1 / 2 revolution clockwise. Adjust the following valves: Intake No. 5, 6, Exhaust No. 1, 2.
  10.  
  11. Run the engine until the normal operating temperature is reached. Reset all clearances, using the procedures listed above under Engine Running.
  12.  

HYDRAULIC LIFTERS



1972-78 Vehicles

All cars, with the exception of those few already discussed, use a hydraulic tappet system with adjustable rocker mounting nuts to obtain zero lash. No periodic adjustment is necessary.

 
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