Chevrolet 1988 Light Duty Truck Repair Manual page 424

6A3-4 4.3 LITER V
-6
A. R egu lator Valve (Shown In O pen Position)
B. S uction
C. Oil Pressure Sw itch
D. Valve L ifter G allery
E. Main Oil G allery
F. B ypass Valve
Front V iew Rear V iew
Show ing Path O f Oil To Tim in g C hain. Show ing M ain Gallery, Oil F ilter And C rankshaft Oil Feed.
F-05526
Figure 2— Engine Lubrication Diagram