Brand new Darton MID Block Sleeves for Honda/Acura B16 81mm Bore Engine Part: 400-110 The Darton MID kits feature: Improved block integral strength Improved cooling "Wet sleeve" replace-ability Increased horsepower output potential Superior oil and compression control Street or strip application Kits can be installed by your local machine shop Superior cylinder sealing and ring wear Ductile iron w/130,000 psi tensile strength Darton sleeve kits also come in a standard “flanged” design for blocks with a closed deck.