YEHERIT LS MLS Exhaust Manifold Gasket & Bolt Kit — Direct-Fit for GM LS Engines with OE-Style Bolts

YEHERIT LS MLS Exhaust Manifold Gasket & Bolts Kit is a direct-fit multi-layer steel gasket set with OE-style bolts designed to restore a reliable, high-temperature seal between the exhaust manifold and cylinder head.

This kit replaces part numbers 12617944 and 12558573 and is engineered for a broad range of GM LS-family vehicles. Built from multi-layer steel (MLS) and supplied with matching bolts, it restores exhaust sealing, reduces leaks and helps preserve engine efficiency. The set is made to mirror the fit and function of original components for a straightforward swap during manifold servicing or replacement.

Which vehicles does this gasket kit fit?

This kit covers many General Motors models across Chevrolet, GMC, Buick, Cadillac, Hummer and Pontiac lineups spanning late 1990s through recent model years. Check the detailed vehicle list to confirm year and engine compatibility before ordering to ensure correct fitment.

• Chevrolet: Avalanche, Camaro, Colorado, Express, Impala, Monte Carlo, Silverado, Suburban, Tahoe, Trailblazer (various years listed).
• GMC: Canyon, Envoy, Savana, Sierra, Yukon (selected years).
• Buick/Cadillac/Pontiac/Hummer: selected models such as LaCrosse, Escalade, GTO, H2/H3 families.
• Reference part numbers included: 12617944, 12558573, 12600530, 12620947; bolts OE 551696.

How does the MLS material benefit exhaust sealing?

Multi-layer steel gaskets use stacked, formed metal layers to maintain a compressive, heat-resistant seal between flange surfaces. MLS resists warping and erosion better than single-layer or composite gaskets, remaining stable under repeated thermal cycles.

• High-temperature resilience reduces leak risk in hot exhaust environments.
• Multi-layer construction maintains clamp load and sealing under vibration.
• Improved longevity compared with older composite gasket designs.

What does the kit include and why are the bolts important?

The package contains MLS exhaust manifold gaskets plus OE-style bolts sized to the application. Using replacement bolts avoids mixed hardware issues and ensures correct stretch and torque characteristics critical to a durable seal.

• Complete gasket set sized for LS-series manifold flanges to match factory profiles.
• Bolts provided (OE 551696) to restore correct clamping force and thread engagement.
• Reference numbers on the listing help verify fitment for specific vehicles and engines.

How straightforward is installation and what should I watch for?

Designed as a direct replacement, the kit simplifies manifold service but requires careful preparation for best results. Clean flange faces, inspect for warpage or damage, and follow torque sequence and values to prevent leaks or fastener failure.

• Thoroughly clean mating surfaces and remove old gasket residue before installation.
• Check manifold and head flanges for straightness; replace if significantly warped.
• Torque bolts in specified sequence to manufacturer specs to secure an even seal.

Who is this for: This gasket and bolt set suits DIY mechanics, professional technicians, and fleet managers maintaining GM LS-platform engines who need a durable, OEM-style exhaust manifold seal. It’s ideal when replacing a leaking manifold gasket, doing head work, or rebuilding the exhaust flange assembly and when correct fit and heat resistance matter.