ZONFANT MLS Exhaust Manifold Header Gasket Kit for GM LS Engines - 2 MLS Gaskets & 12 Bolts, Direct-Fit High-Temp Seal

ZONFANT MLS exhaust manifold header gasket kit with twelve bolts is a direct-fit replacement designed for most LS-series GM engines (excluding LS7).

This gasket kit replaces worn or leaking manifold seals and restores a reliable exhaust seal between the cylinder head and header. Supplied as a complete set—two multi-layer steel (MLS) gaskets and 12 bolts—this kit mirrors OE dimensions and fits a broad range of Chevy, GMC, and Cadillac LS-family engines. The components are engineered to withstand high temperatures and repeated thermal cycling so you can reinstall headers quickly and reduce exhaust leaks and noise.

What engines and part numbers does this kit fit?

The ZONFANT kit is compatible with nearly the entire LS engine family except the LS7. It is intended to replace several OE part numbers commonly used across GM vehicles.

• Compatible engines: LS1, LM7, LR4, LQ4, LS6, L59, LQ9, LM4, L33, LS2, LH6, L92, L76, LY2, LY5, LY6, LC9, LFA, LH8, LMG, LS3, L98, L9H, L20, L94, LZ1, L99, L96, LC8, L77.
• Replaces OE numbers such as 12558576, 12600530, 12620947, 12617944, and 551696.
• Check your vehicle’s engine code and existing part number before ordering to confirm fitment.

How durable are these gaskets and bolts under heat and vibration?

Each gasket is made from multi-layer steel (MLS), a material chosen for its resilience against high exhaust temperatures and its ability to maintain a stable seal through repeated heat cycles. The included bolts are matched to the kit to ensure proper clamping force and alignment.

• MLS construction resists warping and maintains sealing integrity with thermal expansion.
• Bolts are specified to match OEM torque and clamp patterns.
• Materials are selected to resist corrosion typical in exhaust environments.

Is installation complex and what comes in the package?

Installation is straightforward for anyone comfortable with basic engine work and header removal. The kit arrives with everything needed to reseal both exhaust manifolds—no extra gaskets or hardware required in most cases.

• Package contents: 2 MLS header gaskets and 12 mounting bolts.
• Direct-fit design follows factory dimensions for straightforward replacement.
• Recommended: clean mating surfaces and follow OEM torque sequence during install.

What warranty and support are offered?

ZONFANT backs this exhaust manifold gasket kit with a one-year warranty and a straightforward return policy. Customer support is available to address fitment questions or replace defective items under the warranty terms.

• One-year limited warranty from date of purchase.
• Products tested before shipping and marked as brand new.
• Customer assistance available for installation or part verification.

Who is this for: This kit is ideal for DIY mechanics, professional technicians, and vehicle owners restoring or repairing Chevy, GMC, or Cadillac vehicles powered by LS-series engines (except LS7). If you need a reliable, OEM-dimensioned exhaust manifold gasket set with matching bolts to eliminate exhaust leaks and ensure proper header clamping, this ZONFANT kit provides an economical, direct-replacement solution.