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Catalog #66252, #66253
©2006 Edelbrock Corporation
Page 3 of 3
Brochure #63-66252
Rev. 8/06 - DA/mc
• ASSEMBLY OF EXTENSION PIPES ON GM PICK-UP
1. If your vehicle is 4-wheel drive, cut the right side exhaust pipe 1/2" in front of weld on catalytic converter,
(See Fig. 1)
. Cut left side exhaust pipe 2" in front of weld on a 15° angle cut,
(See Fig. 2)
. After cutting, place
unit back in vehicle.
Edelbrock Corporation, 2700 California St., Torrance, CA 90503
Tech Line: 1-800-416-8628
E-Mail: Edelbrock@Edelbrock.com
1 3/4"
2"
Left Side on Four Wheel Drive
Catalytic Converter
Fig. 2
2. Install T.E.S. pipes to headers with donut gaskets, 3/8” x 2” bolts and lock washers supplied in kit. Be sure to locate
donut gasket with equal space all around for best seal
(See Fig. 3).
NOTE: Be sure to have the correct pipe on each side of the catalytic
assembly, or it will not set right. I.D. stamped on part: 25-9654-right,
25-9655 left (4 wheel drive), 25-9653 left (2wheel drive).
3. Use a 1-1/2” spacer under each catalytic converter to hold the
assembly at its proper height.
4. With everything in its place, weld pipes to cats. Remove spacers,
tighten all bolts.
5. Re-install O2 sensors.
• FINAL INSPECTION
1. Check all lines (hydraulic, vacuum, air conditioning and fuel) to
ensure there is adequate clearance to T.E.S. components.
2. Re-connect battery.
3. At this point it is a good idea to look everything over and make sure
that nothing was missed in assembly.
4. Start vehicle and bring up to normal operating temperature. Check
for possible leaks.
5. Turn engine off and let cool. Tighten all bolts again.
Make sure there
is equal spacing
all around
connection
Fig. 3
Side View of Extension Pipe Connection
Donut Gasket