GM Cadillac 1967-1989 Repair Guide

HEI System Maintenance


Except for periodic checks of the spark plug wires, and an occasional check of the distributor cap for cracks (see Steps 1 and 2 under Engine Runs Rough or Cuts Out for details), no maintenance is required on the HEI System. No periodic lubrication is necessary; engine oil lubricates the lower bushing, and an oil-filled reservoir lubricates the upper bushing.