For 1990-2009 cars

# SMU - SEC. 6 - ENG. MECHANICAL REV. TORQUE SPECS FOR

#### SUBJECT: SERVICE MANUAL UPDATE - SECTION 6 - ENGINE MECHANICAL REVISED TORQUE SPECIFICATIONS FOR CYLINDER HEAD BOLTS

#### MODELS: 1997-98 CHEVROLET CORVETTE 1998 CHEVROLET CAMARO 1998 PONTIAC FIREBIRD WITH 5.7L V8 ENGINE (VIN G - RPO LS1)

THIS BULLETIN REVISES THE TORQUE SPECIFICATIONS FOR THE FASTENER TIGHTENING TABLE AND CYLINDER HEAD INSTALLATION PROCEDURES IN SECTION 6 OF THE SERVICE MANUAL, DUE TO A BOLT MATERIAL CHANGE. PROCEDURE:

1. CYLINDER HEAD BOLTS (FIRST PASS ALL M11 BOLTS (1-10) IN SEQUENCE) 30 N.M (22 LB FT).

2. CYLINDER HEAD BOLTS (SECOND PASS ALL M11 BOLTS (1-10) IN SEQUENCE) 90 DEGREES.

3. CYLINDER HEAD BOLTS (FINAL PASS ALL M11 BOLTS (1-8) IN SEQUENCE--EXCLUDING THE MEDIUM LENGTH BOLTS (9 AND 10) AT THE FRONT AND REAR OF EACH CYLINDER HEAD) 90 DEGREES.

4. CYLINDER HEAD BOLTS (FINAL PASS M11 MEDIUM LENGTH BOLTS (9 AND 10) AT THE FRONT AND REAR OF EACH CYLINDER HEAD IN SEQUENCE) 50 DEGREES.

5. CYLINDER HEAD BOLTS (M8 INNER BOLTS (11-15) IN SEQUENCE) 30 N.M (22 LB FT).

(INSERT ART VPOLS153)

FIGURE 1--CYLINDER HEAD BOLT LOCATIONS

FIGURES: 01 ATTACHMENTS: 00

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.