Upgraded B58 Head Gasket MLX Design The MLX Gasket (Multi-Layer-Steel-Stopper) features an extra 'stopper' fold-over layer providing a torque limiting surface that prevents yeilding of the combustion seals. High temperature polymer along with embossments provide a micro seal for fluids against the head and block surface. # of layers: 4Bore Shape: RoundBore Size (MM): 83Compressed Thickness: .036Material: MLX