Edelbrock 6501 User Manual

RIGHT SIDE

LEFT SIDE

Due to production tolerances, it may be

HEADERS #6501

Applications: 1999-2002 GM, 1500/2500 Series Pick -Up,

Suburban, Tahoe, Yukon 4.8L/5.3L/6.0L V-8 Auto, 2 & 4 WD

§ 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 [e-mail].

§ 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.
ü 3/8” ratchet socket set with extensions and universal 13mm and 15mm swivel sockets
ü Set of combination wrenches
ü Jackstands, screwdrivers, pliers, crescent wrench, etc.
ü 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.

Dual Catalytic with A.I.R. and EGR

INSTALLATION INSTRUCTIONS

1. Disconnect and remove spark plug wires. 1. Disconnect and remove spark plug wires.

2. Disconnect E.G.R. flange. 2. Disconnect A.I.R. flange.

3. Disconnect A.I.R. flange.

4. Unbolt dip stick tube.

5. Unbolt and remove manifold.

6. 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.

7. Install E.G.R. flange using supplied gasket.

8. Install A.I.R. flange using supplied gasket (use
factory hardware).

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.

Note: Thick washers are to be used on slotted

holes of port flange.

5. Re-install spark plug wires.

6. Install A.I.R. flange using supplied gasket (use
factory hardware).

Note:

necessary to bend the motor mount heat shield for
better clearance.

§ ASSEMBLY OF EXHAUST PIPE § FINAL INSPECTION

Note: The stock donut on 4.8L & 5.3L gasket on

right exhaust manifold will be re-used with
headers.

This system comes with 2 exhaust crush
rings. On 4.8L & 5.3L V8s, only one will
be used on the left side collector. 6.0L
vehicles will use one on the left side and
one on the right side to replace factory­installed crush rings.

1. On 4.8L & 5.3L V8s - Remove the donut gasket
from right side exhaust manifold. Using a pair of
pliers, remove the retaining ring from the donut
gasket and place the donut gasket in flare of
factory exhaust pipe.

2. Using supplied hardware, re-attach the factory

exhaust pipes to the headers and tighten bolts
evenly to ensure a tight seal. (Note: The 7/16 x 2
bolts are to be used on the right side of 4.8L &

5.3L V8s and the 7/16 x 1 ¾ are for the left side of

4.8L & 5.3L V8s, or both sides on 6.0L V8).

HARDWARE SUPPLIED

Qty. Description Qty. Description

1. Check all lines (hydraulic, vacuum, air
conditioning and fuel) to ensure there is
adequate clearance to headers.

2. Re-connect battery.

3. At this point, it is a good idea to look
everything over and make sure that nothing
was missed in assembly.

4. Start vehicle and bring up to normal operating
temperature. Check for possible leaks.

5. Turn engine off and let cool. Tighten all bolts
again.

1 #25-9175 Header left side 6 7/16” Lock washers
1 #25-9160 Header right side 6 7/16” Hex Nuts
4 Hex header bolts; 8mm x 1.25 x 30mm 6 7/16” Flat washers
8 Hex header bolts; 8mm x 1.25 x 25mm 1 E.G.R. gasket
2 Port gaskets 14 5/16” Lock washers (header flange)
6

7/16” x 1 ¾ Hex bolts

2

Exhaust crush rings

3 7/16” x 2 Hex bolts 2 A.I.R. Flange gaskets

PLEASE complete and mail your warranty card. Be sure to write the model number of this product in the
“Part #________” space. Thank you.

4 Hardened washers(for header flange) slotted

holes

Edelbrock Corporation

2700 California Street

Torrance, California 90503

Toll-Free Tech Line [phone]

Tech E-mail: [e-mail]

2001 Edelbrock Corporation Rev. 12/01
C:\WINWORD\Installation Instruction\6501 - Shorty Headers.Doc