Mr. Gasket 5900 Ultra-Seal Exhaust Manifold Gaskets - 2 Per Set Square port gasket has 1.48 height and 1.45 width Expanded steel core provides stability and maximum torque retention to eliminate gasket failure Graphite facing provides heat resistance and thermal conductivity to transfer heat away from the cylinder head Conforms to and seals minor surface irregularities Recommended for original equipment replacement, high performance street, drag race, and oval track applications