For 1990-2009 cars

# SMU - SEC. 6A-54 - REVISED CYLINDER HEAD INSTALLATION

#### SUBJECT: SERVICE MANUAL UPDATE - SECTION 6A-54 - REVISED CYLINDER HEAD INSTALLATION PROCEDURE

#### MODELS: 1997 BUICK LESABRE 1997 OLDSMOBILE EIGHTY-EIGHT, LS, LSS, REGENCY 1997 PONTIAC BONNEVILLE

THIS BULLETIN IS BEING ISSUED TO REVISE THE CYLINDER HEAD INSTALLATION PROCEDURE IN SECTION 6A - ENGINE MECHANICAL, PAGE 6A-54 IN THE 1997 SERVICE MANUAL.

REVISE THE TEXT OF THE NOTICE, AFTER STEP 1 TO READ AS FOLLOWS:

#### NOTICE:

INSTALLING THE HEAD GASKET WITH THE ARROW POINTING TO THE REAR OF THE ENGINE WILL CAUSE GASKET FAILURE AND POSSIBLE ENGINE FAILURE. HEAD GASKETS ARE NOT INTERCHANGEABLE.

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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.

COPYRIGHT 1998 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.