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PASSENGER SIDE DRIVERS SIDE
INSTALLATION INSTRUCTIONS FOR GIBSON SHORTY HEADERS GP500S
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.
SUGGESTED TOOLS
12MM & 15MM &10MM SOCKET & WRENCH, VARIOUS LENGTH EXTENSIONS, 3/8” SWIVEL, 3/8” RATCHET,
JACK, JACKSTAND, & ANTI-SEIZE
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) FIRST, DISCONNECT THE BATTERY, THEN REMOVE 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.
3) MARK ALIGNMENT OF THE SHAFT BEFORE REMOVING,THEN REMOVE THE BOLT FROM THE
STEERING SHAFT. SLIP STEERING SHAFT APART, BY GRASPING THE UPPER PART OF THE SHAFT
(PART ABOVE THE BOLT) AND SLIDING IT UP.
5) REMOVE THE SIX BOLTS HOLDING THE DRIVERS SIDE EXHAUST MANIFOLD TO THE HEAD, THEN
REMOVE THE MANIFOLD FROM THE TOP. 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.
4) FROM UNDERNEATH THE VEHICLE REMOVE THE SIX 15MM FASTNERS THAT HOLD THE Y-PIPE TO
THE STOCK MANIFOLDS.