WARRANTY NOTES 1) The utmost care is taken at Thorley Headers to ...

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WARRANTY NOTES 1) The utmost care is taken at Thorley Headers to maintain the highest standards of quality.











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WARRANTY NOTES
1) The utmost care is taken at Thorley Headers to maintain the highest standards of quality.
However, Thorley Headers cannot control the installation of the product. For this reason, theThorley Headers warranty covers only the replacement of the components - not the labor forthe installation.
2) The use of any type of header wrapping voids the warranty. Using any sort of wrapping
material on the headers destroys the tubings ability to dissipate heat, causing very rapiddeterioration of the metal and the subsequent failure of the headers.
3) The chrome plating applied to all Thorley headers is a high-nickel chrome finish applied to
retard corrosion. This is a heat chrome to preserve the metal. This finish is not showchrome intended for the sake of appearance. This high-nickel chrome turns colors andapproaches black as it cooks into the metal. The brilliance of the chrome finish is not cov-ered under the warranty. Contamination of the surface by foreign substances may produceother color patterns. This can be prevented by routine cleaning.
B Y
S U M M I T
I N D U S T R I E S
THY-616Y / THY-616Y-S
JEEP 304-401
72-92 J-SERIES PICKUP,
WAGONEER, CHEROKEE
12 - 3/8-16 x 1 Header bolts21 - 3/8 Star lock washers6 - 3/8-16 x 1-1/4 Hex head bolts3 - 3/8-16 x 2-1/2 Hex head bolts9 - 3/8-16 Hex nuts9 - 3/8 Flat washers12 - 5/16-18x1 Header Bolts12 - 5/16 Star Lock Washers
1 - Right side header1 - Left side header1 - Connector pipe assembly1 - Catalytic converter adapter1 - Hot air pickup1 - Heat riser2 - Header gaskets2 - 2-1/2 Collector gaskets1 - 3 Collector gasket
PARTS INCLUDED
HARDWARE INCLUDED
TOOLS REQUIRED
Heating torchMig welderCut-off sawSawzall3/8", 7/16", 9/16", 1/2", 3/4", 7/8"Wrenches10mm, 13mm Wrenches9/16" Line (flare nut) wrench5/16", 7/16", 1/2", 9/16" Sockets3/8", 7/16" Deep sockets15mm Deep socket5/8" Spark plug socketRatchet and extensionsPliersCrescent wrenchTorque wrenchRust penetrantHigh-temp sensor-safe silicon sealer(rated at 600 degrees+)







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4) Retain all paperwork pertaining to the purchase of your Thorley product. Save your receipt!
Your limited warranty is not valid without a receipt of purchase.
The installation of headers onto any vehicle must be performed in accordance with all govern-mental regulations that might pertain to the particular vehicle receiving the headers. Please callyour Thorley Headers distributor if there are any questions regarding the legality ofthe installation. The Executive Order (E.O.) number for this part number is D-540.
WARRANTY NOTES
1) It is important that you read the entire instruction sheet before initiating any installation.
2) Thorley headers are designed to fit only factory installed engine and transmission combi-
nations. We cannot guarantee that Thorley headers will fit in the case of engine swaps ortransmission swaps.
3) Due to restricted room in the e