Darton Dry Cylinder Sleeves for EZ30 Engines

The Darton 300-028-SF/DF dry cylinder sleeves are engineered to replace the factory liners in Subaru EZ30 6-cylinder engines, offering enhanced durability and performance potential. Constructed from bulletproof Darton ductile iron with a 130,000-psi tensile strength, these sleeves are designed to withstand the rigors of high-boost and high-horsepower applications, making them suitable for racing or heavily modified street cars. The dry sleeve design contributes to improved block integral strength and better cooling. Darton offers two flange options for this application: SF (Single Flanged) and DF (Double Flanged). The SF sleeves are a suitable and cost-effective option for many performance builds, providing durability and a good seal. The DF sleeves feature both top and bottom flanges, offering superior stability and preventing movement or distortion under extreme stress, which is ideal for the most demanding engine builds. The product specifications include a Bore OD of 3.8 inches, Wall thickness of 0.152 inches, Length of 4.952 inches, and a Diameter of 4.1 inches, with an application size range of 89mm-92mm for the EZ30 6 Cyl engine. Installation of these sleeves can typically be performed by a local machine shop. Darton provides a full installation manual available on their website. These sleeves are specifically designed for Subaru EZ30 engines and are noted as incompatible with vehicles not utilizing this specific engine configuration. Enhanced performance potential, superior oil and compression control, and better cylinder sealing are key benefits.