Fits 1965-1990 Chevrolet 396-454 Mark IV Big Block - 4.540 Inch Gasket Bore
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 - 4.540 inch; Compressed thickness - .040 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 regulationsApplication Summary:
| Year | Make/Model |
|---|---|
| 1965-1975 | Chevrolet Bel Air |
| 1965-1972 | Chevrolet Biscayne |
| 1973-1974 | Chevrolet Blazer |
| 1969-1972 | Chevrolet Brookwood |
| 1975-1980 | Chevrolet C10 |
| 1968-1974 | Chevrolet C10 Pickup |
| 1968-1980 | Chevrolet C10 Suburban |
| 1990 | Chevrolet C1500 |
| 1975-1986 | Chevrolet C20 |
| 1968-1974 | Chevrolet C20 Pickup |
| 1968-1986 | Chevrolet C20 Suburban |
| 1975-1986 | Chevrolet C30 |
| 1967-1974 | Chevrolet C30 Pickup |
| 1988-1990 | Chevrolet C3500 |
| 1967-1972 | Chevrolet Camaro |
| 1966-1976 | Chevrolet Caprice |
| 1965-1973 | Chevrolet Chevelle |
| 1968 | Chevrolet Chevy II |
| 1965-1974 | Chevrolet Corvette |
| 1966-1975 | Chevrolet El Camino |
| 1969-1970 | Chevrolet Estate |
| 1973-1974 | Chevrolet G10 Van |
| 1976 | Chevrolet G20 |
| 1973-1974 | Chevrolet G20 Van |
| 1975-1976 | Chevrolet G30 |
| 1988-1990 | Chevrolet G30 |
| 1973-1974 | Chevrolet G30 Van |
| 1965-1976 | Chevrolet Impala |
| 1976 | Chevrolet K10 |
| 1979-1980 | Chevrolet K10 |
| 1968-1974 | Chevrolet K10 Pickup |
| 1968-1974 | Chevrolet K10 Suburban |
| 1976-1978 | Chevrolet K20 |
| 1980 | Chevrolet K20 |
| 1968-1974 | Chevrolet K20 Pickup |
| 1968-1974 | Chevrolet K20 Suburban |
| 1985 | Chevrolet K20 Suburban |
| 1977 | Chevrolet K30 |
| 1980-1986 | Chevrolet K30 |
| 1968-1974 | Chevrolet K30 Pickup |
| 1988-1990 | Chevrolet K3500 |
| 1976-1978 | Chevrolet K5 Blazer |
| 1969-1972 | Chevrolet Kingswood |
| 1973-1975 | Chevrolet Laguna |
| 1965-1967 | Chevrolet Malibu |
| 1973-1975 | Chevrolet Malibu |
| 1970-1975 | Chevrolet Monte Carlo |
| 1969-1972 | Chevrolet Nova |
| 1973 | Chevrolet P10 Van |
| 1970-1971 | Chevrolet P20 Van |
| 1973 | Chevrolet P20 Van |
| 1981-1982 | Chevrolet P30 |
| 1970-1974 | Chevrolet P30 Van |
| 1987-1988 | Chevrolet R20 |
| 1987-1988 | Chevrolet R20 Suburban |
| 1989 | Chevrolet R2500 |
| 1989-1990 | Chevrolet R2500 Suburban |
| 1987-1988 | Chevrolet R30 |
| 1989-1990 | Chevrolet R3500 |
| 1969-1972 | Chevrolet Townsman |
| 1987-1988 | Chevrolet V20 Suburban |
| 1990 | Chevrolet V2500 Suburban |
| 1987-1988 | Chevrolet V30 |
| 1989-1990 | Chevrolet V3500 |
| 1975-1978 | GMC C15 |
| 1975-1978 | GMC C15 Suburban |
| 1968-1974 | GMC C15/C1500 Pickup |
| 1968-1974 | GMC C15/C1500 Suburban |
| 1979-1980 | GMC C1500 |
| 1979-1980 | GMC C1500 Suburban |
| 1975-1978 | GMC C25 |
| Attributes | |
| Application | Big Block Chevy |
| ASIN | B000GVISBG |
| Bore Diameter | 4.540 in. |
| Brand | Mr. Gasket |
| California Proposition 65 | No |
| Clearance Category | Gaskets |
| Compressed Thickness | 0.040 in., .040 inch |
| Compression Ratio | 16:1, Up to 16:1 |
| Country of Origin (Primary) | IT |
| Emission Code | 5 |
| Engine | Chevrolet Big Block Mark IV |
| Engine Make/Size | Chevrolet Big Block Mark IV |
| Gasket Bore | 4.540 in., 4.540 inch |
| Gasket Line | MLS |
| Harmonized Tariff Code (Schedule B) | 8409915085 |
| Hazardous Material Code | N |
| Item Weight | 1.200 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 | N/A |
| Product Type | Head Gasket |
| Quantity Per Pkg. | 1 |
| SDR Required Flag | N |
| Warranty | Limited Lifetime Warranty |
| Weight | 1.2, 1.2000 |
| GTIN | 00084041131510 |