Edelbrock Automobile Parts GM 1500 Series User Manual

HEADERS #6502  
Applications: 2001-2002 GM 1500/2500 Series Pick-Up,  
Avalanche, Suburban, Tahoe, Yukon  
4.8L/5.3L/6.0L V-8 Auto, 2 & 4 WD Dual Catalytic  
without A.I.R. or EGR  
2003 Hummer II 6.0L V8 without A.I.R. or EGR  
INSTALLATION INSTRUCTION  
PLEASE study these instructions carefully before installing your Headers. If you have any questions or  
problems, please call our Technical Hotline at: 1-800-416-8628 from 8:00 am - 5:00 pm, Monday-Friday, Pacific  
Standard Time or e-mail us at [email protected].  
HEADERS: 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 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)  
SPECIAL NOTICE: This Edelbrock part has received an Executive Order from the California Air Resources  
Board (C.A.R.B.) making it legal for street use on pollution-controlled motor vehicles in all 50 states. To assist  
you with emissions equipment certification, we have included a silver fan shroud decal to help testing personnel  
verify that this part is a legal replacement part on the vehicle for which it is cataloged. The adhesive-backed  
decal should be affixed to your fan shroud next to the existing emission and engine specification decal. Do not  
cover your original equipment specification decal with the Edelbrock fan shroud decal.  
WARNING: The use of “Thermal Wrap” or any aftermarket coating process will void the warranty on your  
headers. Those products can cause excessive heat and moisture buildup resulting in corrosion and early failure of  
the system.  
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 dipstick tube.  
3. Unbolt and remove manifold.  
4. Install flange gasket and header from top. Install  
header bolts, lock washers, and thick flat washers  
supplied, ensure proper alignment and tighten  
bolts.  
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 tighten  
bolts.  
Note: Thick washers are to be used on slotted  
holes of port flange.  
4. Re-install spark plug wires.  
Note: Thick washers are to be used on slotted  
holes of port flange.  
5. Re-install spark plug wires.  
6. Re-fasten dipstick tube.  
Note: Due to production tolerance, it may be  
necessary to bend the motor mount heat shield for  
better clearance.  
 

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