Cylinder Sleeve 4.375 ID Bore 4.629 OD

The Cylinder Sleeve 4.375 ID Bore 4.629 OD from MELLING is a precision-engineered engine component designed for restoring and rebuilding cylinder blocks in high-mileage or worn engines. This universal cast iron sleeve serves as a critical replacement for damaged or scored cylinder walls, allowing machinists and engine builders to return compromised blocks to serviceable condition without full replacement. Cylinder sleeves are essential for performance rebuilds, vintage engine restoration, and heavy-duty applications where cylinder wall integrity is paramount.

Manufactured from durable cast iron, this sleeve features a 4.375-inch inner diameter bore and 4.629-inch outer diameter with a 0.254-inch wall thickness, providing optimal structural support and thermal conductivity for reliable ring sealing and piston clearance. The 8.125-inch height accommodates standard small-block applications and delivers the wall strength necessary to withstand modern combustion pressures and ring loading. MELLING's quality casting ensures consistent bore geometry and surface finish, critical factors in achieving proper ring seal and minimizing blowby during engine operation. The universal design allows for flexible fitment across multiple engine platforms when properly honed to final specification.

Engine builders, machine shops, and enthusiasts working on small-block V8 and inline engines will find this cylinder sleeve indispensable for repair work where original bore diameter has been compromised by wear, scoring, or piston seizure. Installation requires precise honing to the engine's piston and ring specifications, making it compatible with any rebuild that demands OEM-quality cylinder wall restoration. Weighing 4.1 pounds, the sleeve is straightforward to handle during assembly and integration into cylinder head and block preparation workflows.