Compare Maximum number of 4 items selected Flowtech Real-Seal Round Port Multi-Layer Steel (MLS) Exhaust Header Gasket - 99153 Part #: 99153 Line: FLT Flowtech Real-Seal Round Port Multi-Layer Steel (MLS) Exhaust Header Gasket 90 Day Limited Warranty Material: Multi-Layer Steel (MLS) Port Shape: Round Quantity: 2 Thickness (mm): 3.18mm Thickness (in): 0.125 Inch Port Size (in): 2.150 Inch Port Size (mm): 54.61mm Air Check Valve Included: No Engine Family: GM Big Block Collector Gaskets Included: No Flange Gaskets Included: Yes Show More Show Less