Owners manual

INSTALLATION INSTRUCTIONS FOR GIBSON SHORTY HEADERS GP137

INSTALLATION OF THESE HEADERS REQUIRES AN ADEQUATE WORKSPACE, GENERAL MECHANIC’S TOOLS, GENERAL

MECHANIC’S KNOWLEDGE, AND A REASONABLE DEGREE OF EXPERIENCE. MOST AUTO-ENTHUSIASTS WITH THESE

RESOURCES WILL HAVE LITTLE DIFFICULTY INSTALLING THESE HEADERS. HOWEVER, YOU SHOULD CAREFULLY

READ THE INSTRUCTIONS BEFORE ATTEMPTING TO INSTALL THESE HEADERS. IF IN DOUBT, CONSULT A

PROFESSIONAL MECHANIC.

1) PLACE VEHICLE IN A LOCATION WHERE THE FLOOR IS SOLID,FLAT, AND HAS ADEQUATE LIGHTING. DO NOT

WORK WITH A HOT ENGINE!!! HEAT CAUSES METAL TO EXPAND AND MAKES REMOVAL OF FASTENERS

DIFFICULT. DISCONNECT THE NEGATIVE BATTERY CABLE. RAISE THE FRONT OF THE VEHICLE TO OBTAIN

ADEQUATE ACCESS TO THE BOTTOM OF THE MANIFOLD FLANGES. USE LARGE BASE JACKSTANDS TO SUPPORT THE

VEHICLE. DO NOT RELY ON THE JACK!! BLOCK THE TIRES TO PREVENT THE VEHICLE FROM ROLLING OFF THE

JACKSTANDS.

2) FROM UNDER THE VEHICLE REMOVE THE 6 FACTORY NUTS THE COLLECTOR THAT HOLDS THE Y-PIPE TO THE

MANIFOLDS. NEXT, DISCONNECT THE SPARK PLUG WIRES BY GRASPING AND GENTLY TWISTING THE SPARK PLUG

BOOT. DO NOT PULL ON THE PLUG WIRES.SPRAY WD-40 OR SOME TYPE OF PENETRATING OIL ON ALL ACCESSIBLE

FASTENERS BEFORE ATTEMPTING TO REMOVE THEM. REMOVE THE FACTYORY DECORATIVE PLASTIC VALVE

COVERS.

3) MARK ALIGNMENT OF THE SHAFT BEFORE REMOVING,THEN REMOVE THE BOLT FROM THE

STEERING SHAFT. SLIP STEERING SHAFT APART. REMOVE THE 10MM BOLT THAT HOLDS THE DIPSTICK

TUBE ON AND PULL THE DIPSTICK TUBE UP AND OUT.

4) REMOVE THE FIVE BOLTS HOLDING THE EXHAUST MANIFOLD TO THE HEAD, THEN REMOVE THE MANIFOLD

FROM THE TOP OF THE ENGINE BAY. NOTE: YOU WILL RE USE THE FACTORY DOME GASKET AT THE

COLLECTOR. SEE PICTURE ABOVE. WITH THE MANIFOLD OUT OF THE WAY, CLEAN ANY CARBON DEPOSITS ON

THE HEAD WITH A WIRE BRUSH. PREPARE THE SUPPLIED HEADER BOLTS WITH A SMALL AMOUNT OF ANTI-SEIZE

TO THE THREADS.

5) INSTALL THE NEW HEADER USING THE SUPPLIED HEAD GASKETS, BOLTS, AND LOCK WASHERS. TIGHTEN

THE GIBSON HEADERS FROM THE MIDDLE BOLT TO OUTSIDE BOLTS.