Page 1 of 3 12-20-2010 DSL
HEADER INSTALLATION INSTRUCTIONS
PART NUMBER D590
Application: 1967-72 Pontiac GTO 326-455
68-72 Pontiac LeMans/Tempest 326-455
PerTronix
©
thanks you for choosing
DOUG’S HEADERS
, the best fitting, highest quality header on the market. In order
to realize the full potential of our good fit, please read and understand these instructions completely prior to starting work.
Check to make sure you received the proper parts for your application. The header number will be stamped on the engine
flange. If you are unsure you have received the proper parts call before you start work.
Be sure to work safe! Whenever you work under the vehicle be sure that it is located on level, solid ground and is supported
by adequate safety stands! Remember: Hot asphalt will not support most jack stands!
Many factors affect the installation of headers, some of which are broken or aftermarket motor mounts, accidents that impact the
configuration of the frame, and/or the installation of different engines or aftermarket cylinder heads.
Attention Customers breaking in new engines: Due to the extreme heat generated during the break-in process, the
appearance of the ceramic coating may be altered in certain areas. The protection characteristics and thermal barrier properties
of the coating is never compromised. It is recommended that a cast iron manifold or old set of headers be used for this process.
Notice: The coating of these headers can be marred or scratched during installation. If the header needs to be returned and is
damaged, you will be charged for recoat.
DISASSEMBLY
1. Disconnect the negative battery cable from the battery.
2. If a car lift is not available, raise the vehicle 3 feet or higher and support with adequate
safety stands. Make sure the vehicle is on a flat solid surface and is stable.
3. Disconnect the headpipes from the exhaust manifolds and move them out of the way.
4. If you are planning on reusing the headpipes, cut them approximately where the header
collectors will exit. If you are not reusing them, remove completely
5. Remove the spark plug wires and spark plugs.
6. Remove the 6 manifold bolts from each manifold and remove the manifolds from the
car. Some Engines only have 4 manifold bolts from the factory. It is highly
recommended that the other two bolt holes on each head be drilled and tapped for
bolts, otherwise header leaks will most assuredly occur and there is no warranty
against this.
7. Remove the gaskets and any gasket material or any carbon deposits that remain on the
head surface. The use of a gasket removal agent will ease the removal of any gasket
material. Use care not to get debris into ports or spark plug holes
Corporate Office: PerTronix Inc. 440 E. Arrow Highway, San Dimas, California 91773 * Phone 909.599.5955 * FAX 909.599.6424 * www.dougsheaders.com
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