PerTronix D3346 User Manual

Corporate Office: PerTronix Inc. 440 E. Arrow Highway, San Dimas, California 91773 * Phone [phone] * FAX [phone] * www.dougsheaders.com

HEADER INSTALLATION INSTRUCTIONS

PART NUMBER: D3346

88-98 Chevy/GMC Pickup 1500, 2500, 3500 2 & 4WD

92-96 Chevy/GMC 3500 Crew Cab & Dually 2WD

92-96 Blazer/Jimmy/Suburban/Yukon/Tahoe 2WD

92-96 Blazer/Jimmy/Tahoe/Yukon 2 Door 4WD

265-400 SBC

PerTronix©

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.

WARNING: These headers are legal for Off Highway use (except in California or states that
have adopted California emission standards) or Racing use (which may never be used on a
Highway) Only. Not legal for highway use on any emissions controlled vehicle!

thanks you for choosing

DOUG’S HEADERS

, the best fitting, highest quality header on the market. In order

DISASSEMBLY

1. Disconnect the negative battery cable from the battery.

2. If a car lift is not available, raise the vehicle 2 feet or higher and support with adequate
safety stands. Make sure the vehicle is on a flat solid surface and is stable.

3. Remove bolts attaching head Pipes and Catalytic converters to stock manifolds. Move
out of the way to allow header installation.

4. Remove the spark plug wires, spark plugs, and spark plug heat shields (discard
shields).

5. Remove the Oxygen sensor from the left side pipe, save for reinstallation.

Part No. 0110-003085 Page 1 of 3 Rev 3 8-15-2011 DSL

6. Remove the oil dipstick tube, alternator, power steering pump and any brackets
mounted to the exhaust manifolds.

7. Remove the air injection system and diverter valve; these headers have no provision for
A.I.R. so the system will have to be removed from the vehicle.

8. Remove the exhaust manifolds from the vehicle.

9. 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.

INSTALLATION

1. Starting on the passenger side, remove the motor mount through bolt and jack the
motor up 2-3”. Be sure to use a flat piece of wood between the oil pan and jack to
prevent damage to the oil pan.

2. Apply a THIN film of Ultra Copper Hi-Temp, Sensor-Safe Silicone Sealer to each side
of one header gasket and stick the gasket to the passenger side header flange.

3. From below, slip the right side header and gasket into place and use two bolts to
loosely hold it in place.

4. Lower the motor back onto the mount, reinstall and tighten the motor mount bolt.

5. Replace the dipstick using the original stud and supplied spacer. Install the supplied
bolts and washers in the remainder of the bolt holes. Torque to 35 lbs/ft. Tighten the
center two bolts first and then work your way out.

6. Apply a THIN film of Ultra Copper Hi-Temp, Sensor-Safe Silicone Sealer to each side
of one header gasket and stick the gasket to the driver’s side header flange.

7. From below, slip the left side header and gasket into place and use two bolts to loosely
hold it in place.

8. Modify the alternator/power steering bracket as shown in the illustration. Install the
bracket using the stock studs and supplied spacer.

9. Install the supplied bolts and washers in the remainder of the bolt holes. Torque to 35
lbs/ft. Tighten the center two bolts first and then work your way out.

10. Install the alternator and power steering pump.

11. Install the oxygen sensor into the left side header, using a small amount of anti seize on
the threads. Be careful not to get the anti seize on the probe as this could damage it
causing poor performance and rough running. Hook up the Oxygen sensor wire.

12. Reinstall the spark plugs and spark plug wires

13. Cut and weld your exhaust system to the supplied reducers to complete your
installation.

14. Connect the negative battery cable.

IMPORTANT CHECK LIST

Be sure that all brake lines and fuel lines are clear of headers and/or connector pipes.
All spark plug wires, battery cables, or other electrical components should be clear of

headers and/or connector pipes.

If dipstick tube was removed, make sure it is installed properly and that the dipstick has

been replaced.

Part No. 0110-003085 Page 2 of 3 Rev 3 8-15-2011 DSL