G 20 Van V6-262 4.3L VIN Z (1993)
To eliminate the noise, use the appropriate procedure below. In determining which procedure is appropriate, inspect the engine identification number
stamped on the engine block. The attached diagrams show the location of the engine identification number on the block. Use Procedure 1 for engines
with a "W" in the source code location (first position). Use Procedure 2 for engines with a "T" in the source code location.
Procedure 1
For LB4 engines with a "W" in the source code location. These engines have pressed-in studs and an adjustable lash valvetrain.
Unlash all intake and exhaust valves. Using the valve lash procedure outlined in the service manual, lash the valves in 1.75 turns down from zero lash
(not 1 turn).
Procedure 2
For L35 engines or LB4 engines with a "T" in the source code location. These engines have screw-in studs and a net lash valvetrain.
Remove old rocker arm nuts, rocker arms, rocker balls, and studs from the cylinder head and discard. Install adjustable lash service studs P/N 476530.
