Chev 4.8L LS1 6.0L Round Port Remflex Exhaust Manifold Gaskets # REM2049Chev 4. 8L LS1 6. 0L Round Port Remflex Exhaust Manifold Gaskets # REM2049 Remflex Exhaust Gaskets are soft and compressible so the suggested torque for each gasket, which is generally much lower than factory torque, is listed on the back of each package. Remflex is made in the USA so we control every step of the manufacturing process guaranteeing a superior product that you can rely upon. Remflex's unique flexible graphite material has been proven