Fits 1963-1976 Pontiac 326-455 V8 - 4.270 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 - 4.270 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 |
|---|---|
| 1968-1971 | Pontiac Acadian |
| 1968-1969 | Pontiac Beaumont |
| 1963-1976 | Pontiac Bonneville |
| 1963-1976 | Pontiac Catalina |
| 1967-1970 | Pontiac Executive |
| 1967-1976 | Pontiac Firebird |
| 1973-1975 | Pontiac Grand Am |
| 1975-1976 | Pontiac Grand LeMans |
| 1963-1976 | Pontiac Grand Prix |
| 1971-1976 | Pontiac Grand Safari |
| 1971-1975 | Pontiac Grandville |
| 1964-1973 | Pontiac GTO |
| 1967-1974 | Pontiac Laurentian |
| 1976 | Pontiac Laurentian |
| 1963-1976 | Pontiac LeMans |
| 1967-1974 | Pontiac Parisienne |
| 1976 | Pontiac Parisienne |
| 1963-1966 | Pontiac Star Chief |
| 1969-1970 | Pontiac Strato-Chief |
| 1963-1970 | Pontiac Tempest |
| 1971-1976 | Pontiac Ventura |
| Attributes | |
| Application | Pontiac |
| ASIN | B008NMCNWA |
| Bore Diameter | 4.270 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 | Pontiac V8 |
| Engine Make/Size | Pontiac V8 |
| Gasket Bore | 4.270 in., 4.270 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 | N/A |
| Product Type | Head Gasket |
| Quantity Per Pkg. | 1 |
| SDR Required Flag | N |
| Warranty | Limited Lifetime Warranty |
| Weight | 0.85, 0.8500 |
| GTIN | 00084041034491 |