Edelbrock 65022 Header Installation Instructions 350
User Manual: 65022
Open the PDF directly: View PDF 
.
Page Count: 2
©2007 Edelbrock Corporation
Catalog #65022 & 65023
Page 1 of 2
Brochure #63-0364
Rev. 8/07 - DA/mc
Edelbrock Header
For 2001-2008 GM 1500/2500 Series Pick-Up, Avalanche,
Suburban, Tahoe, & Yukon,
4.8L, 5.3L & 6.0L, V8 Auto,
2 & 4 Wheel Drive, Dual Catalytic without A.I.R. or E.G.R.
AND 2003-2008 Hummer II 6.0L V8 without A.I.R. or E.G.R.
Catalog #65022 (Ceramic) & 65023 (Ti-Tech)
INSTALLATION INSTRUCTIONS
Please study these instructions carefully before installing your new Header. If you have any questions, please contact our Technical
Hotline at : 1-800-416-8628 from 7 am - 5pm, Monday-Friday, Pacific Standard Time or e-mail us at
Edelbrock@Edelbrock.com.
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 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.
INSTALLATION INSTRUCTIONS
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.
IMPORTANT NOTE:
Proper installation is the responsibility of the installer. Improper installation will void warranty and may
result in poor performance and engine or vehicle damage.
©2007 Edelbrock Corporation
Catalog #65022 & 65023
Page 2 of 2
Brochure #63-0364
Rev. 8/07 - DA/mc
Edelbrock Corporation, 2700 California St., Torrance, CA 90503
Tech Line: 1-800-416-8628
Office: 310-781-2222
Tech Fax: 310-972-2730
E-Mail: Edelbrock@Edelbrock.com
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 4.8L, 5.3L, & some 6.0L V8s. The 7/16 x 1 ¾ are for
the left side of 4.8L & 5.3L V8s, and on the 6.0L V8 that
do not have OE donut gaskets.
3. After the factory exhaust pipes have been tightened to
the collector flange of the header, tighten the port flange
bolts to recommended factory specifications.
FINAL INSPECTION
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.
Note: Thick washers are to be used on slotted holes
of port flange.
4. Re-install spark plug wires. Note: Due to production
tolerance, it may be necessary to bend the motor
mount heat shield for better clearance.
ASSEMBLY OF EXHAUST PIPE
Note: Some 2007 model year vehicles will have a donut
gasket on the right side OE exhaust manifold. If your vehicle
has that donut gasket, it will be re-used with your shorty
headers (see below).
This system comes with 2 exhaust crush rings. On 2001-
2006 4.8L & 5.3L V8s, one will be used on the left side
collector. On 2001-2006 6.0L vehicles will use one on the left
side and one on the right side to replace factory-installed
crush rings.
1. On 4.8L, 5.3L, & 6.0L V8s with donut gasket -
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.
Qty. Part # Description
125-9223 Manifold Left Side (#65022)
125-9224 Manifold Right Side (#65022)
125-9229 Manifold Left Side (#65023)
125-9230 Manifold Right Side (#65023)
4 - Hex header bolts; 8mm x 1.25 x 30mm
8 - Hex header bolts; 8mm x 1.25 x 25mm
2 - Port gaskets
3 - Hex bolts; 7/16” x 2
PARTS LIST
Catalog #65022 (Ceramic-Coated)
Catalog #65023 (Ti-Tech Coated)
Qty. Part # Description
6 - Hex bolts; 7/16” x 1-3/4”
2 - Exhaust crush rings
6 - Lockwashers; 7/16”
6 - Hex nuts; 7/16”
6 - Flat washers; 7/16”
14 - Lock washers; 5/16” (header flange)
4 - Hardened washers (for header flange)
for slotted holes
