Edelbrock 66722 Installation Instructions

Please study these instructions carefully before installing your new Tubular Exhaust System (TES). 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.
TUBULAR EXHAUST SYSTEM: These components are designed as a system to improve the exhaust efficiency of the GM 5.7 Liter
LS1 V8 engine. They are constructed of 409 HP stainless steel to better withstand the high heat present with the fuel injected engine,
especially when used for heavy duty applications. The stainless steel used for these systems is much more durable than mild steel,
although it does not appear different in appearance. Note that a magnet will stick to this type of stainless steel; magnetic attraction
is not a valid test for these systems. A performance gain can be expected by the installation of the system. This system does
require welding for installation and retains all O.E.M. emissions equipment.
Suggested Tools Needed for Installation: This vehicle has metric fasteners.
❑ MIG welder (recommended) or gas welder. Professional welding is highly recommended.
❑
1/4" ratchet and socket set
❑
3/8" ratchet socket set with extensions and universal 13mm and 15mm swivel sockets
❑
Combination set of open-end wrenches
❑
Hack saw
❑
Jackstands, screwdrivers, pliers, crescent wrench, etc.
❑ Liquid penetrant, (GM #1052627) anti-seize compound (GM #5613695)
SPECIAL NOTICE: This Edelbrock Tubular Exhaust System 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 Tubular
Exhaust Systems. Those products can cause excessive heat and moisture buildup resulting in corrosion and failure of the system.
NOTE: High temperature spark plug wires and boots are recommended to withstand heat from T.E.S.
Proper installation is the responsibility of the installer. Improper installation will void warranty and may result in
Qty. Description
❑ 1
Header left side #25-9461 (#66722)
❑ 1
Header right side #25-9462 (#66722)
❑ 1
Header left side #25-9144 (#66723)
❑ 1
Header right side #25-9145 (#66723)
❑ 1
Extension pipe right side #25-9658
❑ 12
Hex header bolts; 8mm x 1.25" x 30mm
❑ 2
LS-1 V8 port gaskets
❑ 1
Donut gasket; 2-1/4"
❑ 1
Catalytic converter gasket
Catalog #66722, 66723
©2008 Edelbrock Corporation
For 1998-1999 Chevrolet/Pontiac, Camaro/Firebird; Z-28,
IMPORTANT NOTE:
poor performance and engine or vehicle damage.
KIT CONTENTS
Catalog #66722 (Ceramic-Coated), #66723 (Ti-Tech Coated)
T/A, & Formula, 5.7L LS1 V8 (Dual Catalytic Converters)
Qty.
❑ 3
❑ 3
❑ 2
❑ 5
❑ 12
❑ 12
❑ 1
❑ 2
Page 1 of 2
TUBULAR EXHAUST SYSTEM
Catalog #66722, #66723

INSTALLATION INSTRUCTIONS

Description
Hex nuts; 3/8" - 16
Hex bolts; 3/8" - 16 x 1-1/2"
Hex bolts; 3/8" - 16 x 2"
Flat washers; 3/8"
Lock washers; 5/16"
Hardened washers; 5/16" I.D. x 1/8" thick
E.G.R. Gasket
A.I.R. Gasket
Brochure #63-66722
Rev. 3/08 - AJ/mc