Edelbrock 5.7L V8 Installation Instructions

Catalog PN 6527

©2002 Edelbrock Corporation

Page 1 of 3

Rev. 5/02

Edelbrock Header

Catalog #6527

For 1979-1987 Chev/GMC  Pick Up, Suburban and 

1983-1986 Blazer, Jimmy 5.0L, 5.7L V8

INSTALLATION INSTRUCTION

Please study these instructions carefully before installing your new Header.  If you have any questions or problems, 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 V8 engine.  This system does

not require welding for installation (see note below) and retains all O.E.M. emissions equipment.  These Edelbrock

headers are street legal in all 50 states.

SPECIAL NOTE:  Read Carefully Before Beginning Installation

Before beginning installation of your new shorty headers, you will need to first determine whether or not these shorty

headers will fit your vehicle without additional modifications to your factory stock exhaust system.  GM used several

different styles of exhaust manifolds on the model year vehicles listed above.

The most common exhaust manifolds used on the above-listed vehicles are down swept manifolds; meaning, the stock

exhaust manifolds when installed sweeps under the spark plugs as seen in

Figure 1.  Note the location and position of the outlet of the left (driver’s side)

manifold.  Part #6527 is a direct replacement for stock exhaust manifolds as

shown in Figure 1.  Some vehicles within the above year coverage came with

exhaust manifolds that rise up and over the spark plugs as shown in Figure 2.

Part #6527 is not a direct replacement for the upsweeped manifold.  A new Y-

pipe will have to be fabricated or your stock one will need to be modified.

Most any muffler shop should be able to handle this.

Suggested Tools Needed for Installation:  This vehicle has universal metric

fasteners.

❑ 

3/8” rachet socket with extensions, metric and standard sockets

❑ 

Set of combination wrenches

❑ 

Jackstands, screwdrivers, pliers, crescent wrench, etc.

❑ 

Liquid penetrant, (GM #105627) and anti-seize compound (GM

#5613695)

❑

Spark plug terminal crimper

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.

Fig. 1

Fig. 2