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 ourTechnical 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.
K 3/8” rachet socket with extensions, metric and standard sockets
K Set of combination wrenches
Fig. 1
K Jackstands, screwdrivers, pliers, crescent wrench, etc.
K Liquid penetrant, (GM #105627) and anti-seize compound (GM
#5613695)
K 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.
Fig. 2
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.
Catalog PN 6527
Page 1 of 3
Rev. 5/02
KIT CONTENTS
Catalog #6527
Qty.
1
Description
Qty.
2
Description
Manifold left side #25-9204
Manifold right side #25-9205
Heat transfer tube
Spacer tubes; 5/8” O.D x 3/4” long
Spacer tubes; 5/8” O.D. x 1-1/2” long
Hex bolts; 3/8” x 2-1/2”
12-pt. head bolts; 3/8” x 2-3/4”
Hose clamps
1
2
1
3
2
Spark plug boot heat tubes
Chevy V8 port gaskets
Donut gasket
2
2
2
1
8
Black hardened washer; 3/8”
Hose (A.I.R.); 3/4” x 35”
Hex bolts; 3/8” x 1-1/2”
Air conditioning bracket
Lock washers; 3/8”
1
Heat riser gasket
1
1
O2 sensor plug
3
1
Heat stove
1
6
Flat washers; 3/8”
18
2
10
2
Hex header bolts; 3/8” x 1”
Hex header bolts; 3/8” x 1-3/4”
Hex header bolt; 3/8” x 1/4”
90-degree Spark boot
8
8
90-degree Plug term
Edelbrock Corporation
2700 California St.
Torrance, CA 90503
Tech Line: 1-800-416-8628
E-Mail: edelbrock@edelbrock.com
Catalog PN 6527
Page 3 of 3
Rev. 5/02
|