Spark Plugs - Revised Gap Specification

Number: 91-515-6D

Section: 6D

Date: SEPT. 1992

Corporate Bulletin No.: 266401R

ASE No: A1, A8

Subject:
SPARK PLUG GAP REVISED SPECIFICATION

Model and Year:
1991 S/T TRUCKS WITH 4.3L ENGINE

SERVICE UPDATE

The following represents revised information for SECTION 6D4 in the 1991 S/T service manuals.

This information replaces the plug gap information found under "Spark Plugs" in "Specifications."

The gap for plugs used in the 4.3L (LB4) (VIN Z) engine should be 0.035 inch, not 0.045 as stated in the manual. Torque remains as stated.