Edelbrock 63-65903 Installation Instructions

©2007 Edelbrock Corporation

Catalog #65903

Page 1 of 2

Rev. 8/07-DA/mc

Brochure #63-65903

®

Edelbrock Race Header

For 1993-1997 F-Body, 5.7L, LT1

Catalog #65903

INSTALLATION INSTRUCTIONS

Please study these instructions carefully before installing your new Race Header. They provide general guidelines to be

studied and understood before you remove your stock system. Failure to follow these instructions may void your warranty.

If you have any questions, please contact our Technical Hotline at : 1-800-416-8628 from 7 am – 5 pm, Monday

through Friday, Pacific Standard Time or e-mail us at Edelbrock@Edelbrock.com.

DESCRIPTION: Edelbrock race header components are designed to improve the exhaust efficiency of the F-body, 5.7L

LT1 engines. A performance gain can be expected with the installation of the system. These headers are intended for

racing applications and are not legal for use on pollution-controlled vehicles.

Suggested tools needed for installation: This vehicle has some metric fasteners.

❑ 3/8” ratchet socket set with extensions and a good assortment of metric & SAE sockets

❑ Combination wrenches (metric & SAE)

❑ Universal 12mm and 14mm swivel sockets

❑ Floorjack, jackstands, screwdrivers, pliers, crescent wrench, etc.

❑ Liquid penetrant (GM #1052627 or equivalent); anti-seize compound (GM #5613695 or equivalent)

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 Flow Race Y-Pipe #6571 or #65711 can be used with these headers.

INSTALLATION INSTRUCTIONS

NOTE: These race headers come with weld in A.I.R.

and EGR provisions.  These can be installed if

desired or as needed to be legal for certain race

classes.

DISASSEMBLY

1. Disconnect battery negative cable from battery.

2. Jack and support vehicle with proper load-rated

jackstands on proper surface.

3. Remove alternator and alternator to exhaust

support bracket.

4. Remove starter motor. Remove spark plugs and

oil filter.

5. Remove exhaust crossover and O2 sensors.

6. Remove exhaust manifolds.

7. Remove oil pressure sensor.

8. Loosen bolts retaining steering rack and pull

slightly forward.

Mark steering shaft for

reference and remove steering coupler shaft.

Left Side

1. Remove left engine mount bolt, support and lift

engine approximately 1-1/2”.

Unbolt and

remove engine support bracket and engine

mount.

2. NOTE: This is a good time to check the condition

of your engine mounts. Replace worn or broken

mounts.

(Polyurethane mounts are available

from Energy Suspension Products). Place one

header bolt, lock washer, and hardened washer

with port gasket in the front bolt hole.

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.