Exhaust gasket is made of .030" Multi Layer Steel material which can withstand extreme temperatures and maintains a torque set. Gasket features 2.250" Round Port. Cometic MLS (Multi-Layer Steel) Exhaust Gaskets are designed for extreme cylinder pressures. MLS Exhaust Manifold Gaskets maintain a torque set and resist corrosion. They will not burn through or push out. MLS Exhaust Manifold Gaskets withstand different combinations of cylinder head and exhaust manifold materials. No sealants are required. GM Big Block V8 Exhaust Manifold Gasket. Made of .030in. Multi Layer Steel material which can withstand extreme temperatures and maintains a torque set. 2.250in. Round Port. Pair .030" MLS Exhaust Manifold Gasket. Pair