Ultra-Seal Header Gaskets Fits 1965-1990 Chevrolet 396-454 Mark IV Big Block Square Port, 1.85 Inch x 1.90 Inch Mr Gasket Suspension - Leaf Springs - Leaf Spring Perches External Fan Included: No

External Fan Included: No

Extended Length mm: 541

Cab length rock slider

Designed by Rough Country's in-house Research and Development team

2011-2013 Chevrolet Silverado 3500 HD GAS 4 Door Extended Cab Pickup

Ultra-Seal Header Gaskets Fits 1965-1990 Chevrolet 396-454 Mark IV Big Block Square Port, 1.85 Inch x 1.90 Inch Mr Gasket Suspension - Leaf Springs - Leaf Spring Perches External Fan Included: NoManufactured from high temperature steel core graphite faced exhaust material. Expanded steel core provides stability and maximum torque retention to eliminate Gasket failure. Graphite facing provides excellent heat resistance and thermal conductivity to transfer heat away from the cylinder head. Conforms to and seals minor surface irregularities. High recovery material allows header or manifold flange to stay sealed if flange loses clamp load. Can be