Product information "Cometic Chevy BB Gen IV 396/402/427/454 H/G 4.320 inch Bore .027 inch MLS Head Gasket"
MLS Cylinder Head Gasket; For Block w/ 2 H2O Holes Each End / Lower 3 Open Bore Diameter: 4.320in Engine Block Configuration: Lower 3 Open Engine: GM Gen II/ Mark IV Big Block V8 Thickness: .027in