Brian Tooley Racing BTR LS9 MLS Multi-Layer Steel Head Gasket Set (pair of 2) for LS Engines up to 4.100" bore The BTR LS9 head gasket can't be beat for performance and value. These head gaskets have been proven to be reliable north of 1,000 horsepower. These gaskets feature a 4.100" bore and a .055" thickness spread across 7 layers of steel. These can be used in place of GM part #12622033. Great for Turbo, Supercharged, Nitrous and normally aspirated applications. Fits: 4.8, 5.3, 5.7, 6.0 and 6.2 blocks.
