INFORMATION ON LT5 EXHAUST MANIFOLD SERVICING. Chevrolet Corvette 1992

SUBJECT: INFORMATION ON LT5 EXHAUST MANIFOLD SERVICING

MODELS: 1990-1992 CHEVROLET CORVETTES WITH 5.7L ENGINES (VIN J - RPO LT5) AND 6 SPEED MANUAL TRANSMISSIONS

WHEN SERVICING THE EXHAUST MANIFOLDS ON 1990-1992 CORVETTES WITH LT5 ENGINES, USE THE FOLLOWING PARTS. THESE PARTS ARE THE 1993 PRODUCTION EXHAUST MANIFOLD PARTS. USE THE 1993 PRODUCTION EXHAUST MANIFOLD BOLT PATTERN AND TORQUE SPECIFICATION. PLUG THE EGR HOLE ON THE LH (LEFT HAND) EXHAUST MANIFOLD WITH A 1/4 INCH PIPE PLUG. TAP HOLE APPROXIMATELY ONE INCH DOWN WITH A 1/4 INCH PIPE TAP. SEE TABLE BELOW FOR PIPE PLUG PART NUMBER.

QUANTITY PART NUMBER DESCRIPTION

1 25129492 LH EXH MANIFOLD 1 25143612 RH EXH MANIFOLD 1 25129500 LH EXH MANIFOLD SHIELD OUTER 1 25129498 LH EXH MANIFOLD SHIELD INNER 1 25034993 RH EXH MANIFOLD SHIELD OUTER REAR 1 25034884 RH EXH MANIFOLD SHIELD OUTER FRONT 1 25035039 RH EXH MANIFOLD SHIELD INNER 2 10187776 EXH MANIFOLD GASKETS 16 10067660 EXH MANIFOLD BOLTS 14 10110994 EXH MANIFOLD BOLT SPACERS 2 03983422 EXH MANIFOLD BOLT SPACERS 1 25129502 LH CTLTC CONVERTER 1 25129503 RH CTLTC CONVERTER 8 10174330 CONVERTER BOLTS 12 09440166 MANIFOLD SHIELD BOLTS 1 10137641 LH OXYGEN SENSOR 1 10096129 RH OXYGEN SENSOR 1 12338136 1/4 INCH PIPE PLUG

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION: J0100, J0101 LABOR TIME: USE PUBLISHED LABOR OPERATION TIME.

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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.