Mr. Gasket 108 Intake Manifold Gasket Performance For Use With 1965-1990 Chevy Big Block 396-454; Rectangular Port; 1.75 Inch x 2.50 Inch Port Size; Cellulose/ Nitrile Composite; 0.060 Inch Thick

Compatibility - 1965-1990 Chevy Big Block 396-454, Port Shape - Rectangular, Port Length (IN) - 2-1/2 Inch, Port Width (IN) - 1-3/4 Inch, Port Diameter (IN) - Not Applicable, Material - Cellulose/ Nitrile Composition, Thickness (IN) - 0.060 Inch, Recommended Use - High Performance Street/ Drag Race/ Oval Track