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Engine - Improved Head Gasket

89chevy34

GMC 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.