DOUG S HEADERS Dual Flange for Large Port Heads Instruction Manual
- October 27, 2023
- DOUG S HEADERS
Table of Contents
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DOUG S HEADERS Dual Flange for Large Port Heads
PLEASE READ BEFORE PROCEEDING
PerTronix thanks you for choosing a Doug’s Headers Product. To realize the
potential of Doug’s Headers engineering and excellent fit, Please Read and
Understand these instructions completely prior to starting the installation.
Check that you received all the parts listed on the parts list, if you have
any concerns, please contact PerTronix before continuing. Headers will have
the part number stamped in the flange. Many factors affect he installation of
exhaust headers, including worn or aftermarket motor mounts, previous accident
damage, after market cylinder heads that may have relocated port or spark plug
locations, suspension and steering changes, sagging of original unibody
structures due to age. Coating Notes: Coatings can be marred during
installation if you are not careful. If you are breaking in a new motor, the
extreme heat can alter the appearance of the coating and this is not a
warranty issue. We recommend breaking in new motors with stock manifolds or an
old set of headers. We use sealing beads on all our headers. The raised bead
creates a better seal virtually eliminating leaks if installed properly. It is
important to install all header bolts lightly snug and then tighten to factory
torque spocs starting in the center and working outward. Before starting,
allow the vehicle to cool, disconnect the battery, and spray a penetrating oil
on all hardware and fittings that will need to be removed. Once you remove
your manifold, clean the sealing surface on the head of any old gasket debris
or carbon build up. Work Smart – Work Safe! Most Header and Exhaust
Installation are best performed on a lift. If a lift is not available, raise
the vehicle and support on quality Jack Stands on level ground. Do not rely on
a jack!
DISASSEMBLY
- Remove spark plug wires and spark plugs.
- Remove the alternator. It may help to remove the Master Cylinder.
- The fender wells must be modified for this header to work. There is an illustration on the next page outlining our suggestion for this modification. Carefully cut the inner fender as suggested using a Plasma cutter, Cut Off Wheel or Reciprocating saw taking care not to cut through any wiring or plumbing. Check both side of the Fender well before cutting.
- Remove the gaskets and any gasket material or any carbon deposits that remain on the head surface.
INSTALLATION
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These headers are a dual flange design. Install the inner flange to both heads using the gasket and Counter Sunk Allen head bolts.
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Passenger Side – Working from the top, slide the header through the opening in the inner
fender that you cut and line the header up with the cylinder head. -
Place the gasket into position and start the bolts. After all the bolts are started and you have verified that the header does not contact the inner Fender well, tighten the bolts working from the center out. Trim Fender well as necessary.
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Drivers Side – Installation is the same as the passenger side with the exception of the forward most two bolts. If your alternator or generator mounted to the exhaust manifold, use bracket #H7606 to mount your original alternator bracket. If you don’t have the original bracket, order part #H7607. See illustration for installation.
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Re install spark plugs and wires. Reinstall Master Cylinder if removed.
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Connect the negative battery cable
IMPORTANT CHECK LIST
Be sure that all brake lines, transmission 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. Double-check the tightness of all bolts including brackets and accessories
START THE ENGINE
Start the engine and allow it to warm up to operating temperature. Chock for
any unusual noises or exhaust leaks. If everything is OK, stop the engine and
tighten all bolts while the engine is still warm.
NOTE:
Check the bolts periodically to make sure they have not loosened. Re-tighten
after the first 500 miles and then again at 1000 miles
Parts List
- 1 Left side header
- 2 Header gaskets
- 2 Inner Flanges
- 14 5/16” Internal Lock Washer
- 12 3/8 – 16 Counter Sunk Allen Bolts
- 1 Right side header
- 2 Inner Flange gaskets
- 14 5/16-18 X 1” Header Bolts
- 2 Doug’s stickers
DOUG S HEADERS LIMITED WARRANTY
All Doug’s Headers and Ehaust products are guaranteed, to the original
purchaser, to be free of defects in material and worlcman5,hip for one year
from date of purchase. This warranty covers the replacement or repair of the
product and does not cover the cost of removal and installation, customer
applied coatings, or Any discoloration or corrosion of finished surfaces.
O,amage or product failure resulting from collision, improper installation,
off road use, road hazards, the use of exhaust insulating wrap. or rust
occurring after installation is not covered by the warranty. This warranty
e><tends only to the original purchaser. Should a part be deemed defective, it
should be returned to the original selling retailer and must be accompanied by
the sales receipt. If there is no retailer in your area, contact PerTronix
direct for a return authorization and return the part prepaid to the factory
for inspection. PerTronix reserves the right to replace or repair the alleged
defective part and return the part freight collect.