2003-2008 Hummer II 6.0L V8 without A.I.R. or E.G.R Edelbrock Header Installation Instructions
These components are designed to improve the exhaust efficiency of the GM C.P.I. (Central Port Injection) V8 engine. This system does not require welding for installation and retains all O.E.M. emissions equipment. These Edelbrock headers are street legal in all 50 states.
Suggested Tools Needed for Installation. This vehicle has metric fasteners:
- 3/8″ ratchet socket set with extensions and universal 13mm and 15mm swivel sockets
- Set of combination wrenches
- Jackstands, screwdrivers, pliers, crescent wrench, etc.
- Liquid penetrant, (GM #1052627) anti-seize compound (GM #5613695) or available equivalent.
SPECIAL NOTICE: This Edelbrock part has received an Executive Order number (E.O.#) from the California Air Resources Board (C.A.R.B.) making it legal for street use in all 50 states. To assist you with emission equipment certification, we have included a silver fan shroud decal to help testing personnel verify the this part is a legal replacement on the vehicle for which it is cataloged. The adhesive-backed decal should be affixed next to the existing emission and engine specifications decal. Do not cover any part of your original emission decal.
WARNING: The use of “Thermal Wrap” or any aftermarket coating process will void the warranty on your Edelbrock Headers. Those products will cause excessive heat and moisture buildup resulting in corrosion and failure of the header.
NOTE: High temperature spark plug wires and boots are recommended to withstand heat from Headers.
DISASSEMBLY
1. Disconnect negative battery cable.
2. Unbolt exhaust pipes from manifolds.
RIGHT SIDE
1. Disconnect and remove spark plug wires.
2. Unbolt and remove dipstick tube.
3. Unbolt and remove manifold from top.
4. Install flange gasket and header from top. Install header bolts, lock washers, and thick flat washers supplied. Note: Ensure proper alignment on slotted holes of port flange and only snug bolts at this time.
5. Re-install spark plug wires.
6. Re-install dipstick tube.
7. Some models may require the aluminum heat shield under the A/C receiver dryer to be re-positioned, adjusted or bent to gain some clearance between header and heat shield.
LEFT SIDE
1. Disconnect and remove spark plug wires.
2. Unbolt and remove manifold.
3. Install flange gasket and header from top. Install header bolts, lock washers, and thick flat washers supplied, ensure proper alignment and only snug bolts at this time.
