Engine - Improved Head Gasket
89chevy34GMC NUMBER: 89-6A-121
GROUP: 6A Engine Mechanical
DATE: December, 1989
CORPORATE NUMBER 836537R
SUBJECT: REVISED CYLINDER HEAD GASKET
MODELS: 1987-89 C/K, R/V, S/T, M, G AND P LIGHT TRUCKS WITH 4.3L, 5.0L, AND 5.7L ENGINES (VIN CODES H, K AND Z) AND C5, C6 MEDIUM TRUCKS WITH 5.7L (VIN CODE A) ENGINE.
THIS BULLETIN CANCELS AND REPLACES GMC TRUCK SERVICE BULLETIN 89-T- 16 TO ADD THE 1987-89 S/T AND M MODELS, AND 4.3L ENGINE APPLICATION AND PART NUMBER.
A cylinder head gasket with improved sealing characteristics is now available for service use on all 4.3L, 5.0L and 5.7L engine applications. The applicable part numbers are listed below:
Application Cylinder Head Gasket P/N
4.3L Engines 10105110
5.0L Engines 10105115
5.7L Engines 10105117
Parts are currently available from GMSPO. When replacing head gaskets on vehicles under warranty, use:
Labor Ops: J0500 - Right Bank J0501 - Left Bank J0507 - Both Banks
Refer to Labor Time Guide for applicable labor times for various models.