3mirrors Exhaust Manifold Clamp Repair Kit — LS1/LS2/LS3/LS6 Compatible, Forged-Steel Blocks & HRF 10.9 Bolts

3mirrors 917-107 Exhaust Manifold Clamp Repair Kit restores a sealed connection between the exhaust manifold and cylinder head on many GM LS-family engines without removing the head.

If a broken or stripped manifold bolt is causing an exhaust leak on a Camaro, Corvette, GTO, CTS-V, or GM truck with an LS-series engine, this repair kit offers a fast, durable fix. The kit includes forged-steel repair blocks and high-strength bolts designed to clamp the manifold to the cylinder head, re-establishing a reliable seal while avoiding costly cylinder-head removal or time-consuming bolt extraction.

How does this kit stop exhaust leaks quickly?

The repair bracket clamps directly to the cylinder head and captures the manifold flange, closing the gap that causes leaks. Because the block clamps around the OEM bolt hole area, you don’t need to drill out broken studs or replace the entire head. Installation is straightforward with basic hand tools, letting you address the leak in a few hours.

• Forged-steel repair block provides clamping force where original threads have failed
• High-grade HRF 10.9 bolts for strong, long-lasting fastening
• Fits the manifold flange to reseal without head removal

Which engines and vehicles is the 917-107 kit compatible with?

This kit covers a broad range of GM small-block and related engines across model years and platforms. It supports many LS-family engines and numerous GM cars, trucks, and SUVs, making it well-suited for common performance and factory V8 applications. Check vehicle fitment carefully for side and corner-specific kits.

• Compatible with LS1, LS2, LS3, LS6 and many other LS/LT/LY/LX family engines
• Fits Chevrolet Camaro, Corvette, Trans Am, GTO, G8, CTS-V, Silverado, Sierra and more
• Reference OE numbers: 917-107 and 11518860 for cross-checking

What’s included and what tools are needed for installation?

The kit supplies the forged repair block(s) and the required high-strength bolts for a solid repair. Typical installations require common hand tools and, in some cases, minor manifold movement to access fasteners. The kit replaces the failing bolt interface so you avoid drilling or thread repair in the head.

• Forged-steel clamp block(s) and HRF 10.9 bolts included
• Basic hand tools (ratchet, sockets, torque wrench) are sufficient
• No need to remove cylinder head or drill out broken bolts in most cases

Will this repair last and how strong is the hardware?

The clamp block is forged for strength and the bolts meet high-grade HRF 10.9 specifications, providing robust clamping force for exhaust applications. While longevity depends on proper installation and preventing overtightening, the materials and design aim for a long-term repair under normal driving and performance conditions. For heavily modified exhaust systems, inspect periodically for looseness or vibration.

• Forged steel construction resists deformation under load
• HRF 10.9 bolts deliver high tensile strength for secure clamping
• Periodic inspection recommended on modified or high-vibration setups

Who is this for: This 3mirrors 917-107 kit is intended for DIY mechanics, professional technicians, and performance enthusiasts who need a cost-effective, time-saving repair for exhaust manifold bolts on GM LS-family engines. It’s especially useful when facing stripped, broken, or inaccessible manifold bolts and when you want to avoid the expense and labor of cylinder head removal. If you need a different corner of the engine, confirm side-specific kits in the 3mirrors store before ordering.