Precise CNC-machined, prevents the editable cylinder sleeve flexing that typically comes with Honda race engines. Top race research and development department has designed a superior sleeve saver that can eliminate engine sleeve flex. This sleeve saver features a revolutionary design that reinforces your cylinder sleeves while promoting the necessary and adequate water flow insuring the cooling principles of the engine. For any serious racer Block Saver is the Original Block Guard. 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 Guard slips into the Coolant Moat that surrounds the Cylinders. This is a weak part of the Honda / Acura Engine and will Result in Cracked Cylinder Sleeves when Turbo or Supercharger Boost is used. The Block Saver can be pressed in or welded in and will Install in 2-3 Hours.