Fits 1965-1990 Chevrolet 396-454 Mark IV Big Block. Square Ports, 2.09 Inch
- Manufactured from high-temperature steel core/graphite faced exhaust material
- Expanded steel core provides stability and maximum torque retention to eliminate gasket failure
- Graphite impregnated facing provides excellent heat resistance and thermal conductivity to transfer heat away from the cylinder head
- Conforms to and seals minor surface irregularities
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