Fits GM 7.4L LSX Engines - 4.200 Inch Gasket Bore - 0.051 Inch Compressed Thickness OE Equivalent.
Our unique Multi-Layered steel head gasket embossment formation process optimizes the embossment radius, reduces stress points, enhances gasket conformability, and provides uniform clamp load distribution. This all results in superior surface contact between block and cylinder head. All head gasket layers/spacers go through an additional process to significantly reduce forming induced stress. Advantages are reduced brittleness in material, increased flexibility and deformation retention. This stabilizes the gasket, resulting in reduced cylinder bore distortion and improved combustion seal fro the extreme cylinder pressures found in high compression, supercharged and turbocharged applications. A proprietary polymer coating ensures the micro-seal of engine coolant and oil fluids.
A typical MLS head gasket requires a smoother (30Ra) surface finish than composite head gaskets. Mr. Gasket's proprietary polymer coating will seal a surface finish twice as rough (60Ra) as a typical MLS head gasket. For high performance street, drag race and oval track use. Mr. Gasket provides a Limited Lifetime Warranty for MLS cylinder head gaskets.
Our unique Multi-Layered steel head gasket embossment formation process optimizes the embossment radius, reduces stress points, enhances gasket conformability, and provides uniform clamp load distribution. This all results in superior surface contact between block and cylinder head. All head gasket layers/spacers go through an additional process to significantly reduce forming induced stress. Advantages are reduced brittleness in material, increased flexibility and deformation retention. This stabilizes the gasket, resulting in reduced cylinder bore distortion and improved combustion seal fro the extreme cylinder pressures found in high compression, supercharged and turbocharged applications. A proprietary polymer coating ensures the micro-seal of engine coolant and oil fluids.
A typical MLS head gasket requires a smoother (30Ra) surface finish than composite head gaskets. Mr. Gasket's proprietary polymer coating will seal a surface finish twice as rough (60Ra) as a typical MLS head gasket. For high performance street, drag race and oval track use. Mr. Gasket provides a Limited Lifetime Warranty for MLS cylinder head gaskets.
- Gasket bore - 4.200 inch; Compressed thickness - .051 inch
- Manufactured from 3-layer premium grade stainless steel and state of the art laser cutting
- Optimized sealing embossments seals extreme cylinder pressure
- Provides excellent stability and reduces cylinder bore distortion.
- Proprietary polymer coating ensures the micro seal of engine coolant and oil fluids.
- Ideal for supercharged, turbocharged, nitrous oxide and extreme compression ratio engines
- For high-performance street, drag race and oval track use
Information:
Holley Performance Emission Code 5: This part is legal for sale or use on Emissions Controlled Vehicles; Uncontrolled (Non-Emissions Controlled) Vehicles; and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations| Attributes | |
| Application | GM LS |
| ASIN | B008NMCPOG |
| Bore Diameter | 4.200 in. |
| Brand | Mr. Gasket |
| California Proposition 65 | No |
| Clearance Category | Gaskets |
| Compressed Thickness | 0.051 in., .051 inch |
| Compression Ratio | 16:1, Up to 16:1 |
| Country of Origin (Primary) | IT |
| Emission Code | 5 |
| Engine | GM Small Block Gen III/IV (LS Based) |
| Engine Make/Size | GM Small Block Gen III/IV (LS Based) |
| Gasket Bore | 4.200 in., 4.200 inch |
| Gasket Line | MLS |
| Harmonized Tariff Code (Schedule B) | 8484100000 |
| Hazardous Material Code | N |
| Item Weight | 0.850 lbs. |
| Life Cycle Status Code | Available Only While Supplies Last |
| Material | Multi-Layered Steel |
| NAFTA Preference Criterion Code | D |
| Package Quantity | 1 |
| Package Type | Retail |
| Packaging | Retail |
| Position | Right |
| Product Type | Head Gasket |
| Quantity Per Pkg. | 1 |
| SDR Required Flag | N |
| Warranty | Limited Lifetime Warranty |
| Weight | 0.85, 0.8500 |
| GTIN | 00084041034286 |