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©2005 Edelbrock Corporation
Rev. 7/05 - DA/mc
Page 2 of 2
Catalog #66642 & #66643
Brochure #63-0429
2. Re-install air inlet tube and air cleaner assembly.
3. Install crossover pipe into Y-pipe assembly. Then, using
the donut gaskets and hardware supplied in kit, install
the crossover and Y-pipe assembly onto header
collectors and catalytic inet.
4. Install clamps provided onto crossover pipe and
catalytic converter and tighten.
FINAL INSPECTION
1. Check all hydraulic, vacuum and fuel lines 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.
Catalog #66642
Qty. Description
1 Manifold left side (#25-9309)
1 Manifold right side (#25-9322)
1 Y-Pipe (#25-9636)
1 Crossover pipe - left (#25-9635)
12 Header bolts; 5/16” - 18 x 1”
12 Lock washers; 5/16”
4 Lock washers; 3/8”
8 Flat washers; 5/16”
4 Hex capscrews; 3/8”-16 x 2”
2 V8 Port gaskets
2 Donut gaskets
1 U-clamp; 2-1/4”
1 Flange, collector
Edelbrock Corporation
2700 California St.
Torrance, CA 90503
Tech Line: 1-800-416-8628
E-Mail: edelbrock@edelbrock.com
Catalog #66643
Qty. Description
1 Manifold left side (#25-9080)
1 Manifold right side (#25-9114)
1 Y-Pipe (#25-9636)
1 Crossover pipe - left (#25-9635)
12 Header bolts; 5/16” - 18 x 1”
12 Lock washers; 5/16”
4 Lock washers; 3/8”
8 Flat washers; 5/16”
4 Hex capscrews; 3/8”-16 x 2”
2 V8 Port gaskets
2 Donut gaskets
1 U-clamp; 2-1/4”
1 Flange, collector
INSTALLATION INSTRUCTIONS
DISASSEMBLY
1. Disconnect negative battery cable.
2. Raise vehicle and remove O2 sensor from factory Y-
pipe, careful not to damage.
3. Unbolt and remove Y-pipe assembly.
NOTE: Removing the Y-pipe from the catalytic
converter may require heating with a torch.
4. Remove air inlet tube and air cleaner assembly.
5. Remove exhaust manifolds.
6. Remove center studs from cylinder head. You will be
using the 5/16” - 18 x 1, header bolts in place of the
studs.
ASSEMBLY
1. Install T.E.S. flange gaskets and manifolds from top
along with header bolts, lock washers and flat
washers supplied. NOTE: Hardened flat washers
are to be used on slotted flange holes.
KIT CONTENTS