YOVOBS LS Exhaust Manifold Gasket Kit — 12-Bolt MLS with Stainless Hardware, OE Fit

YOVOBS 12617944 is a complete 12-bolt MLS exhaust manifold gasket kit engineered as a direct OE-fit replacement for LS-series engines, delivering high-temperature durability and a full stainless hardware set for reliable sealing under heavy use.

Designed to match original equipment part numbers such as 12617944, 12558573, 12600530, and MS16124, this kit replaces worn or leaking exhaust manifold gaskets on many Chevrolet, GMC, Cadillac and other vehicles powered by LS-family V8 engines. The set pairs multi-layer steel gaskets with corrosion-resistant flange bolts, offering a factory-correct fit and stronger clamping than standard hardware. It’s built to endure high under-hood temperatures and preserve exhaust sealing where performance and longevity matter.

How does this gasket kit match my vehicle’s OEM specifications?

The YOVOBS kit is manufactured to OE dimensions and part-number matches so it installs like the original gasket. Each gasket and bolt follows the same bolt pattern, hole spacing and thickness used by factory parts to ensure proper sealing and alignment.

• Direct replacement for PN 12617944, 12558573, 12600530, 12620947, MS16124
• Includes 12 M8 x 1.25 bolts with 25mm underhead length and integrated washers
• Made to original fitment tolerances for LS1/LS2/LS3/LS6 and many other LS variants

Why choose MLS construction for an exhaust manifold gasket?

Multi-layer steel (MLS) gaskets are preferred where extreme heat and cylinder pressure occur because they resist warping, maintain a stable seal, and tolerate thermal cycling better than composite materials. MLS helps prevent exhaust leaks that can cause noise, poor performance, or hot spots on the manifold and head interface.

• High-density MLS resists high-temperature distortion and maintains sealing pressure
• Better longevity under repeated heat cycles common in performance or towing use
• Reduces the risk of exhaust leak-related noise and vibration

What hardware is included and why does it matter?

This kit supplies two exhaust manifold gaskets plus twelve stainless-steel flange bolts engineered for even clamping and corrosion resistance. Replacing both the gasket and bolts during a repair prevents uneven clamping and future failures caused by seized, stretched, or corroded fasteners.

• 12 stainless steel bolts with built-in washers for uniform clamping load
• Bolts are rust-resistant for longer life in harsh environments
• Hardware lengths and thread spec match factory requirements to avoid fitment issues

Which LS engines and vehicles will this kit fit?

This gasket kit covers a broad range of LS-series small- and big-block V8 engines (excluding LS7) and fits many GM platforms. It’s compatible with common displacements and OEM applications across trucks, SUVs and performance cars, but buyers should confirm part numbers or bolt pattern against their application before ordering.

• Fits LS1, LS2, LS3, LS6, LM7, LR4, LQ4, L59, LQ9, LM4, L33 and more (not LS7)
• Compatible with 4.8L / 5.3L / 5.7L / 6.0L / 6.2L LS V8 engines
• Commonly used on Silverado, Sierra, Camaro, Corvette, Tahoe, Escalade and many GM models

Who is this for: This YOVOBS 12617944 MLS exhaust manifold gasket kit is aimed at DIY mechanics, professional technicians and performance enthusiasts repairing or upgrading LS-engine exhaust systems who need a direct OE-style replacement with improved hardware. Choose this kit if you value factory-correct fitment, MLS durability for high-heat environments, and a complete hardware set to avoid repeated disassembly. Always verify your vehicle’s part number and exhaust manifold bolt pattern prior to installation to ensure exact compatibility.