Owners manual

Metal Hanger
Rubber Hanger
Reducer
Collector
Metal Hanger
Muffler
NOTE: The engine compartment is very close and all precautions have been taken to assure a proper fit. There are
many variations in the engine locations proper clearances. Follow these instructions for a much easier
installation.
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Disconnect battery and remove spark plugs (Number wires).
Remove old exhaust pipes, oil filter and casting from block (3 bolts).
Disconnect starter wires and remove starter.
Remove clutch linkage and ball from engine.
Remove bolts from exhaust manifolds.
Loosen lower front motor mounts. Raise engine to remove exhaust manifolds.
Install Headers.
Start rear center header bolt first, then all Header bolts loosely. After all bolts are started, tighten down evenly.
Lower starter wires as much as possible. Reconnect to starter. Install starter. YOU CANNOT SEE STARTER WIRES
AFTER STARTER HAS BEEN INSTALLED.
Start rear header bolt first, then all header bolts loosely. After all bolts are started, tighten down evenly.
Install oil filter. When changing oil in the future, it will be necessary to follow this procedure.
Lower engine and tighten motor mounts. If header come into contact with crossmembers, it will be necessary to replace
motor mounts. Old motor mounts weaken, which lower engine.
Install reducer caps and weld to exhaust pipes.
Reconnect battery and replace spark plugs.
Make sure all wires and lines have sufficient clearance.
LEFT SIDE:
RIGHT SIDE:
Start engine, test drive vehicle, allowing engine to gain normal operating temperature. Check for leaks and new or unusual
noises and after test drive, re-tighten all header bolts.
28140-Instructionsheet-110204.cdr
12438 Putnam Street Whittier, CA 90602 tel [phone] fax [phone]
website: www.hedman.com email: [e-mail]
PART # 28140, 28146
INSTRUCTION SHEET
PONTIAC 1967-81 (326 - 455)
INSTALLATION INSTRUCTIONS:
This is a custom designed exhaust header system, designed for this particular application (s). Do not bend, bang, cut,
dent, drill or heat any portion of this header! Any alteration other than those suggested in this instruction sheet will
void the Hedman Lifetime Guarantee!
To prevent leaks, install your headers using Hedman Hedders exhaust gaskets and a spray copper gasket sealant.ONLY
It is necessary to raise the vehicle at least 36 inches from the ground. A floor hoist is recommended, if not available, use
a hydraulic floor jack with jack stands. DO NOT USE A BUMPER JACK!
CAUTION!
BEFORE STARTING INSTALLATION:
The use of thermal wraps will drastically shorten the life of your Headers, and will void the Hedman “Lifetime Guarantee”.
DO NOT WRAP YOUR NEW HEADERS!
WARNING:
Removal of catalytic converters and other factory air pollution control devices is illegal. We recommend you abide by
the law. Our testing indicates performance is not significantly affected by these devices.
SPECIAL INSTRUCTIONS!
After installing your headers it is very important that your exhaust system be suspended properly. As indicated in the
drawing below you must place hangers as close to the header collector as possible. Rubber hangers should be used to
allow the front of the system to flex with the engine torque. A hanger is needed before and after the muffler (s). When
your exhaust system is unbolted from the header collector, it should remain suspended all by itself. Your Headers Are
Not designed to support your exhaust system. Failure to follow these instructions will most likely result in cracks around
the area where your primary tubes and collector are welded together, and will nullify your "Lifetime Guarantee".
ENJOY YOUR HE DERS WHILE COMBININGA INCREASED FUEL ECONOMY WITH BETTER PERFORMANCE.