Repl Cyl Sleeve Ford AR 4.490 Bore

The Repl Cyl Sleeve Ford AR 4.490 Bore by DARTON SLEEVES is a precision replacement cylinder sleeve engineered for Small Block Ford engines requiring bore restoration or custom engine building. Cylinder sleeves are essential components that restore worn cylinder walls to factory specifications, allowing engines to accept standard piston and ring combinations without costly block replacement. This sleeve addresses both performance rebuilds and stock restoration projects where the original bore has exceeded service limits or where displacement increases demand a larger diameter.

Manufactured from durable steel, this replacement cylinder sleeve features a 4.490-inch bore diameter, 8.000-inch height, 4.801-inch outside diameter, and 0.156-inch wall thickness—specifications that ensure proper interference fit and thermal stability during operation. The 0.156-inch wall provides adequate material for machining bore honing while maintaining structural integrity under combustion pressures and high-RPM stress. DARTON SLEEVES sleeves are precision-cast and honed to tight tolerances, ensuring concentric bore geometry that promotes even ring seating, controlled oil consumption, and consistent compression across all four cylinders in your Small Block Ford engine.

Engine builders, performance enthusiasts, and restoration shops rely on this sleeve when boring blocks for bigger pistons or when original sleeves have been damaged by scoring or corrosion. Installation requires proper press-fitting into the block with subsequent honing to final piston clearance specifications; professional machining is strongly recommended to ensure correct bore diameter, concentricity, and deck height. Compatible with all Small Block Ford applications (289, 302, 351W displacements and variants), this sleeve integrates seamlessly into both stock rebuilds and modified engines designed for increased power output.