Edelbrock Automobile Parts Blazer User Manual

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  
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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  
©
2
002
E
d
elbrock
C
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rporation  
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