Product Description
Michigan Motorsports LS1 LS6 MLS Cylinder Head Gasket – Replaces GM 12589226
3.920-Inch Bore – .051-Inch Thickness – Multi-Layer Steel Construction
Complete a compatible LS engine build with the Michigan Motorsports MLS cylinder head gasket. Designed as a direct replacement for LS1 and LS6 head gasket GM part number 12589226, this gasket combines a 3.920-inch cylinder bore opening with a .051-inch thickness for the supported 4.8L, 5.3L and 5.7L LS-based applications.
Its multi-layer steel construction is designed to maintain a dependable seal under the heat and cylinder pressure generated by stock and performance-oriented LS engines. Produced by the same source as the factory GM version, this Michigan Motorsports gasket provides an application-specific replacement for stock rebuilds, LS swaps and performance engine projects.
Key Features & Benefits
- Replaces GM Part Number 12589226: Designed as a direct replacement for the corresponding GM LS1 and LS6 cylinder head gasket. The OE reference number provides a clear identification point when selecting the correct gasket for a compatible LS engine.
- 3.920-Inch Cylinder Bore Opening: Manufactured with a 3.920-inch gasket bore for the supported 4.8L, 5.3L and 5.7L LS-based engine applications. This exact bore specification helps distinguish the gasket from versions designed around different cylinder-bore dimensions.
- .051-Inch Gasket Thickness: Uses the supplied .051-inch thickness for applications requiring this specific LS1 and LS6 replacement-gasket configuration. Pairing the stated thickness with the 3.920-inch bore provides the critical dimensions needed when planning a compatible engine assembly.
- Multi-Layer Steel Construction: The MLS design uses multiple steel layers to support sealing durability under repeated heat and cylinder-pressure cycles. This construction makes the gasket suitable for compatible stock rebuilds, LS swaps and performance-oriented engine combinations.
- Factory-Source Manufacturing: Produced by the same source as the factory GM version while carrying the Michigan Motorsports brand. This provides an application-specific MLS replacement manufactured to the same standards associated with the corresponding original gasket.
Key Fitments
- LS1 and LS6 engines using GM head gasket part number 12589226
- Compatible 4.8L LS-based engines
- Compatible 5.3L LS-based engines
- Compatible 5.7L LS-based engines
