LS Multi Layer Steel Exhaust Manifold Header Gasket Pair with 12pc Bolt Set Fits all 1997-2013 Gen 3/4 LS Based V8 Engines Including: LS1 LS2 LS3 LS6 LQ4 LQ9 LM7 4.8 5.3 5.7 6.0 6.2 Includes 2 MLS header/manifold gaskets and 12 bolts -Enough for both heads Multilayer Steel (MLS) Gaskets Like GM 12617944 Flanged Grade 10.9 Bolts M8 x 1.25 thread 25mm Underhead Length Fits Factory Exhaust Manifolds and Aftermarket Headers Torque Spec for M8 exhaust bolts is 18 ft-lb