Owners manual
PART # 69830 & 69890
INSTRUCTION SHEET
SMALL BLOCK CHEVY
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Disconnect battery and wire to temperature sending unit. Remove spark plugs.
With gaskets in place, install left header, starting all bolts. Do Not Secure Bolts!
Tighten all header bolts evenly.
With gaskets in place, install right header, starting all bolts. Do Not Secure Bolts!
Replace starter.
Tighten down all header bolts evenly
Replace A.I.R. log installed on headers at this time (If applicable).
With end caps in place, cut factory exhaust pipes so that the system may be secured to the hedders with one
weld on each side.
Replace and re-connect all parts that have been removed or disconnected. Check for proper clearance on
all lines and linkage.
When using this hedder for 82-87 Chevy P/U 4x4 part #69890, you must remove the rubber snubber on the right side of the
vehicle, and lower the rear wire loom bracket on the left side.
Raise the vehicle and support with jack stands.
Use penetrating oil on all nuts & bolts to be removed. This will prevent the possibility of broken or stripped nuts & bolts.
Making sure the converter is cool, remove the exhaust crossover pipe.
Remove fresh air duct to air cleaner along with hot air hose from exhaust manifold to air cleaner air horn.
Remove old exhaust manifolds. If vehicle is equipped with air pump system, disconnect at this time.
Remove clutch cross shaft and starter (If necessary).
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.
69830-instructionsheet-110904.cdr
12438 Putnam Street Whittier, CA 90602 tel (562) 921-0404 fax (562) 921-7515
website: www.hedman.com email: techsupport@hedman.com
Front
Cut along
dotted line
as shown
Left front A/C Bracket
When you remove the stock bracket (late model rotary type compressor short) see diagram to the right. This
shows you how to cut the stock bracket away at the second hole location to clear the header tube for a clean
installation. You will have sufficient strength when using the front hole with a simple spacer equal to the thickness
of the original cast iron manifold that was removed. You will need to mount the air-conditioner bracket and the
power steering bracket to the same bolt with spacer. When your vehicle is equipped with a long round type
(piston type) air conditioning compressor unit, you may have to use Hedman air conditioner bracket part #20110,
which can be purchased at your local dealer.
Metal Hanger
Rubber Hanger
Reducer
Collector
Metal Hanger
Muffler
ENJOY YOUR HEADERS WHILE COMBINING INCREASED FUEL ECONOMY WITH BETTER PERFORMANCE.
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 and the muffler (s). When your exhaust system is unbolted from the header
collector, it should remain suspended all by itself. 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".
before after
Your Headers Are Not
Removal of catalytic converters and other factory air pollution control devices is illegal. We recommend you adhere
to your state’s local laws. Our testing indicates performance is not significantly affected by these devices.
The use of thermal wraps will drastically shorten the life of your Headers, and will void the Hedman “Lifetime Guarantee”.
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!