GM V8 Remflex Exhaust Manifold Gaskets 1-5/16"w x 1-3/8"h Square Port # REM2016GM V8 Remflex Exhaust Manifold Gaskets 1 5 16"w x 1 3 8"h Square Port # REM2016 Exhaust Header Gaskets, Graphite, Square Port, Chevy, Small Block, Pair Port Style: Square port Gasket Material: Graphite Port Height (in.): 1. 375 in. Port Width (in.): 1. 313 in. Thickness (in.): 0. 125 in. Quantity: Sold as a pair. Notes: Suggested torque is 20 ft. lbs. Remflex Exhaust Header Gasket Sets Remflex exhaust header gasket sets feature 100 percent flexible