GM LS Mild Steel 1-5/8" Block Huggers AF9599-1001GM LS Mild Steel 1 5 8" Block HuggersSuit GM LS Series AF9599 1001 9599 1001 The Aeroflow Performance block hugger headers are a universal fitment to suit the GM LS1 LS6 They are a retro fit, tight fit block hugger designed for use in conversion cars. This header kit will include the following: 2 x Header Manifold. 2 x Exhaust Manifold Gasket. 2 x 3 Bolt Collector Flange. 2 x 3 Bolt Collector Exhaust Gasket. 2 x Weld in Oxygen (o2) Sensor M18 x 1. 5mm