GMC Workshop Service and Repair Manuals

Lifter / Lash Adjuster: Specifications
Lifter Diameter and Bore Clearance

Lifter Bore Diameter: 

0.8432"-0.8442"

Lifter Diameter: 

0.8420"-0.8427"

Lifter To Bore Clearance: 

0.0008"-0.0025"