ADD W1 Engine Block Guards are CAD designed & CNC-Machined from high quality aluminum Block Guard provides maximum coolant passage to the head minimizing the risk of head gasket failure. The Design of the Block Guard Combines Cylinder Wall Reinforcement along with Oversize Passages for Coolant Flow. The Block Guard can Handle up to 20psi and is built for the Daily Driven Street Racer. The Block Saver can be pressed in or welded in and will Install in 2-3 Hours. Installation instruction also included in the package