MANATEE MLS Head Gasket Set for GM LS Engines — 2PCS 4.8L/5.3L Direct-Fit, OEM Spec

Manatee 2PCS MLS head gasket set (part 12589226) replaces OEM seals for 4.8L and 5.3L GM LS-family engines to restore cylinder sealing and combustion integrity.

These two Multi-Layer Steel (MLS) head gaskets are engineered to meet GM factory standards for many LS-series V8 engines. They are designed as direct-fit replacements for common GM part numbers (12589226, 12498544, 12565390, 12573949, 98544) and fit many Chevrolet, GMC, Buick, Pontiac, Saab, Cadillac, and Hummer models built roughly between 2002 and 2017. Built to the original specifications, the gaskets aim to re-establish a reliable seal between block and head after a service or repair.

Which engines and vehicles will this gasket pair fit?

This set targets GM LS family V8s—mainly 4.8L, 5.3L and compatible 5.7L applications where the listed part numbers apply. Fitment covers a wide range of trucks, SUVs and cars across Chevrolet, GMC and other GM divisions; exact compatibility should be verified against your VIN and engine casting.

• Fits 4.8L and 5.3L LS-family engines; also used in some 5.7L applications.
• Compatible with Chevrolet Avalanche, Silverado, Tahoe, Suburban, Colorado, Trailblazer, Corvette, Impala, Express.
• Compatible with GMC Sierra, Yukon, Envoy, Canyon, Savana and other GM models listed.
• Check part numbers 12589226, 12498544, 12565390, 12573949, 98544 and verify model years.

How does the MLS construction improve engine sealing?

Multi-Layer Steel (MLS) gaskets use several metal layers with coated sealing beads to maintain clamping and conform to surface irregularities under combustion pressure. MLS designs resist blowout better than composite gaskets and provide consistent sealing for modern high-compression LS engines when installed correctly.

• Layered steel resists deformation and maintains clamping force under heat cycles.
• Sealing beads around combustion bores reduce leakage and improve compression retention.
• Coatings protect against corrosion and help seat the gasket to mating surfaces.
• Engineered to match OEM specs for thickness and bore alignment.

What should I check before installing these head gaskets?

Proper installation requires clean, flat cylinder head and block surfaces, correct torque sequence and, where applicable, new head bolts. Inspect mating surfaces for warpage, pitting or contamination to ensure the MLS gasket can seal as intended. Follow vehicle-specific torque specs and re-torque recommendations if required.

• Verify cylinder head and block flatness; resurface if necessary.
• Replace head bolts/fasteners if recommended by the vehicle manufacturer.
• Use the correct torque sequence and final torque values for LS engines.
• Confirm gasket part numbers match your engine application before installation.

What quality and support does Manatee offer for this part?

Manatee manufactures these head gaskets to meet OEM geometry and functional criteria, and provides after-sales support for fitment or technical questions. The product listing cites strict production standards and a satisfaction guarantee to assist professional installers and DIY mechanics alike.

• Produced to OEM-like specifications for structure and dimensions.
• Engineered sealing performance verified through fitment checks.
• Customer support and service guarantee for post-sale inquiries.
• Sold as a pair to service both cylinder heads on applicable V8 engines.

Who is this for: This Manatee MLS head gasket pair is intended for mechanics, performance shops and experienced DIYers working on GM LS-family V8 engines—particularly owners of Chevy, GMC, Buick, Pontiac, Saab, Cadillac or Hummer vehicles needing a direct-replacement MLS gasket set. Confirm compatibility with your vehicle’s year, engine displacement and OEM part number before purchasing. If you're rebuilding heads, repairing a head gasket leak, or restoring engine compression to factory standards, this set is built to match the fit and sealing needs of those applications.