DOUG S HEADERS D303Y-B 1 3/4 Header Metallic High-Temp Instruction Manual
- June 3, 2024
- DOUG S HEADERS
Table of Contents
DOUG S HEADERS D303Y-B 1 3/4 Header Metallic High-Temp
WARNING:
This product can expose you to chemicals including Lead, Nickel, Cadmium and
Chromium which are known to the State of California to cause cancer and birth
defects or other reproductive harm. For more information go to
www.P65Warnings.ca.gov
PERTRONIX PERFORMANCE BRANDS EMISSIONS CODES
This product is Legal for use on Pre-Pollution Controlled Vehicles. It is legal for use on all vehicles produced Before Emissions Control Regulations were imposed. These are considered Uncontrolled Vehicles and are defined as follows;
- 1965 and Older US Manufactured Calitfornia Certified Vehicles
- 1967 and Older US Manufactured Federally Certified Vehides
- 1967 and Older Foreign Manufactured Vehicles REV 3/2022 1968-91 Models
PERTRONIX PERFORMANCE BRANDS EMISSIONS CODES
This Product is LEGAL for Closed Course Competition use or
Pre-Emissions Controlled Vehicles ONLY. It is Not Legal for use on any
Emissions Controlled Vehicle for Street or Off Highway use.
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, aftermarket 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 specs 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 and mark all spark plug wires and then remove all spark plugs.
- If equipped remove the smog pump AIR fittings from the manifolds.
- Disconnect the head pipes from the exhaust manifolds and remove the manifolds. Depending on your application, you may be required to remove the alternator, dipstick, clutch linkage, and/or oil filter. In some cases it may be necessary to remove the starter and power steering unit. Only remove what is necessary to allow the removal of the manifolds or the installation of the new headers.
- Remove 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.
- It may be necessary to cut the head pipes to allow room to install the headers. If you are installing a new exhaust system you may cut the head pipes any where you choose, but if you are using the existing exhaust you need to cut the head pipes in the proper location so that they will be able to be welded to the reducers supplied with your headers.
ASSEMBLY
- Install the headers from the bottom of the vehicle. Slide the headers and gaskets into place and install a bolt at either end of the header to hold them in place and check for proper fit.
- Check the passenger side header for clearance between the header primary tubes and the frame/engine perch. A minimum of ¼” is recommended. It may be necessary to remove a small amount of metal from the frame/engine perch for proper clearance.
- Once you have determined proper fitment, install the gaskets. Install all of the header bolts and lock washers supplied and hand tighten. Tighten all the bolts evenly.
- Install any accessories that were removed during the header installation.
- NOTE: Some accessories require different brackets than stock and some require the addition of spacers between the bracket and header flange. An example would be on some Chevy applications the driver’s side front bolt must use the original (factory) bolt and use the supplied spacer between the flange and the accessory bracket.
- Install the reducers and determine the connection to the exhaust system.
- Weld the reducers to the exhaust system and install them onto the headers utilizing the gaskets and bolts supplied.
- Install the spark plugs and connect the wires to the proper plug. Reinstall other components that may have been removed (starter, power steering unit).
- If your vehicle has a smog pump and you ordered the headers with A.I.R. fittings, install the A. I.R. tubes at this time.
- If applicable, attach the supplied Hot Air Pickup Tube as shown on below.
- Check to make sure that all the wiring, brake lines, hoses, etc. are clear of the headers or any exhaust component.
- Connect the negative battery cable.
HOT AIR PICKUP TUBE
This tube is supplied to attach the hot air tube from the air cleaner to the header.
- Clamp the hot air pickup tube to the header primary tube using a supplied worm gear hose clarmp.
- The location is determined by the stock configuration.
- If your vehicle is equipped with a solid tube for the hot air pickup, ensure that the adapter is located in a position that is as close to stock as possible.
- Attach the flex hose from the air cleaner to the hot air pickup tube mounted on the header and secure it using a supplied worm gear hose clamp.
- Flexible emissions duct hose is available at most retail auto parts stores should yours require replacement.
Parts List
- 1 Left side header
- 16 3/8”-16 x 1” header bolts
- 1 Right side header
- 6 3/8”-16 x 1 ¼” hex head cap screws
- 6 3/8”-16 hex nut
- 22 3/8” lock-washers
- 1 Hot Air Pickup Tube
- 1 Clamp, Worm Gear, Stainless, #24
- 2 Header gaskets 2 2 ½” reducers
- 2 2 ½”, 3 bolt collector gaskets
- 6 Hex head cap screw, 3/8”-16 x 1-1/4”
- 6 Nut, hex, 3/8”-16
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. Check 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
DOUGS HEADERS LIMITED WARRANTY
- All Doug’s Headers and Exhaust products are guaranteed, to the original purchaser, to be free of defects in material and workmanship 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.
- Damage 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 extends 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.
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