Hawks Motorsports is pleased to offer our clients the following 134-1202 LS1/LS6/LS2/LS3/LS7 12-Point Chromoly Header Bolts, Set of 12, ARP. This ARP header bolt kit is designed for Chevrolet Gen III/IV LS-series applications using headers with a 3/8-inch-wide flange. The bolts feature an M8 x 1.25 thread, 1.181-inch underhead length, 12-point heads, black oxide finish, and 8740 chrome moly construction. The kit includes 12 bolts and washers.

For the gearhead building an LS-powered Camaro, Firebird, Corvette, truck, or swap car, header hardware is one of those small details that can make a big difference when you're actually wrenching on the car. Tight header tubes don't leave much room for a socket, and the compact 12-point head on these ARP bolts gives you useful access where a conventional fastener can become a real pain. The black oxide chromoly finish also fits right in with a serious performance build, whether you're buttoning up a fresh LS, installing long-tube headers, or finishing off an engine bay that's meant to look as good as it runs.

The 134-1202 kit uses an M8 x 1.25 thread and 1.181-inch underhead length. ARP identifies the fasteners as 8740 chrome moly with a 12-point head and black oxide finish. ARP's application information identifies this kit for Chevrolet Gen III/IV LS-series engines and 3/8-inch-wide header flanges.

KEY FEATURES

• Part Number: 134-1202
• Brand: ARP
• Application: Chevrolet Gen III/IV LS-series engines
• Product Type: Header bolt kit
• Thread Size: M8 x 1.25
• Underhead Length: 1.181"
• Head Style: 12-point
• Wrench Size: 10mm 12-point
• Material: 8740 Chrome Moly
• Finish: Black oxide
• Quantity: Set of 12
• Designed for headers with a 3/8-inch-wide flange
• Washers included
• Compact 12-point head provides access around header tubes
• Intended for LS-series header applications

PRODUCT SPECIFICATIONS / PRODUCT DETAILS

ARP's current product information lists 134-1202 as a Chevrolet LS Gen III/IV header bolt kit with 12 bolts, M8 thread, 1.181-inch underhead length and 8740 material.

VEHICLE FITMENT / FITS THE FOLLOWING MODELS

The manufacturer application is engine-based, covering Chevrolet Gen III/IV LS-series engines rather than a single vehicle-specific year range.

Verified Engine Applications

• LS1
• LS2
• LS3
• LS6
• LS7
• Other compatible Chevrolet Gen III/IV LS-series applications using the appropriate header flange and M8 fastener configuration

The specific LS engine application should be verified against the header and cylinder-head combination being used.

Common Vehicle Applications

Depending on engine configuration and header application, Gen III/IV LS engines were used in vehicles including:

• Chevrolet Camaro
• Chevrolet Corvette
• Chevrolet Silverado
• Chevrolet Tahoe
• Chevrolet Suburban
• Chevrolet TrailBlazer
• Chevrolet SSR
• Pontiac GTO
• Pontiac Firebird/Trans Am LS-powered applications
• Cadillac CTS-V
• Other GM vehicles equipped with compatible LS-series engines

Important: The vehicle examples above do not establish universal fitment. Confirm the engine, header design, flange thickness and fastener requirements before ordering.

IMPORTANT APPLICATION NOTES AND EXCLUSIONS

• Designed for Chevrolet Gen III/IV LS-series applications.
• Requires M8 x 1.25 threaded header mounting holes.
• Designed around a 3/8-inch-wide header flange.
• Uses a 1.181-inch underhead length.
• 12-point head.
• 8740 chrome moly construction.
• Black oxide finish.
• Sold as a set of 12.
• Washers are included.
• Do not assume fitment to Gen V LT engines.
• Verify header flange thickness and required fastener length before installation.
• Header manufacturer requirements should take priority when determining the correct fastener length.

INSTALLATION NOTES

• Verify the header and cylinder-head application before installation.
• Confirm the mounting holes use M8 x 1.25 threads.
• Verify that the 1.181-inch underhead length provides the required thread engagement without bottoming in the cylinder head.
• Confirm adequate clearance between the 12-point bolt heads and header tubes.
• Clean the cylinder-head and header flange mounting surfaces before assembly.
• Use the appropriate ARP installation procedure and fastener lubricant.
• Tighten fasteners according to the applicable ARP torque recommendations and header manufacturer's instructions.
• Tighten header fasteners evenly to properly seat the flange.
• Recheck fasteners after initial heat cycles when recommended by the header manufacturer.

FREQUENTLY ASKED QUESTIONS

What engines does ARP 134-1202 fit?

ARP identifies 134-1202 for Chevrolet Gen III/IV LS-series engines. Specific engine and header compatibility should be verified before installation.

What size are the 134-1202 header bolts?

The bolts use an M8 x 1.25 thread and have a 1.181-inch underhead length.

Are these 12-point header bolts?

Yes. The 134-1202 kit uses a 12-point head with a 10mm 12-point wrench size.

What are the bolts made from?

ARP identifies the material as 8740 Chrome Moly.

What finish do these bolts have?

The 134-1202 bolts feature a black oxide finish.

How many bolts are included?

The kit contains 12 header bolts. ARP also specifies that washers are included.

What header flange does 134-1202 fit?

ARP identifies the application for a 3/8-inch-wide header flange.

Will these fit an LS3 Camaro?

They can be appropriate for an LS3 application when the headers use the required M8 x 1.25 mounting configuration and compatible 3/8-inch-wide flange. Verify the specific header application before ordering.

Will these fit a Gen V LT1 or LT4?

Do not assume they will. ARP catalogs separate header fasteners for LS and LT applications. Verify the exact engine family before ordering.