REVISED CYLINDER HEAD GASKET IMPROVED SEALING

Model and Year: 1987-89 PASSENGER CARS AND LIGHT DUTY TRUCKS

THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO. 89-06-6A, DATED SEPTEMBER 1988. THE 4.3L ENGINE APPLICATION AND PART NUMBER HAS BEEN ADDED. ALL COPIES OF 89-06-6A SHOULD BE DISCARDED.

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

These parts are currently available from GMSPO.

When replacing head gaskets on vehicles under warranty, use:

Labor Operation Numbers: J0500 - Right Bank J0501 - Left Bank J0507 - Both Banks

Refer to Labor Time Guide for applicable labor times for various models.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.