Cylinder Sleeve 4.0400 Bore Dia

The Cylinder Sleeve 4.0400 Bore Dia by MELLING is a precision-engineered engine block component designed to restore worn or damaged cylinder bores in vintage, rebuilt, and high-performance engines. This universal cast iron sleeve serves as a critical repair solution for machinists, engine builders, and automotive enthusiasts who need to recover cylinder wall integrity without complete block replacement. Whether you're restoring a classic engine or rebuilding a performance platform, this cylinder sleeve delivers the dimensional accuracy and material durability required for reliable long-term operation.

Manufactured from cast iron, the Cylinder Sleeve 4.0400 Bore Dia features a 4.040-inch bore diameter with a 6.750-inch height and 4.230-inch outer diameter, engineered to provide tight tolerances and excellent wear resistance. The 0.094-inch wall thickness balances structural strength with heat dissipation, preventing hot spots and ensuring consistent thermal management during extended operation. This precise geometry allows proper piston ring seating, optimal combustion chamber sealing, and extended component lifespan—critical factors in both street and competition applications where cylinder wall condition directly impacts compression, blowby control, and overall engine reliability.

Engine builders and block machine shops rely on MELLING cylinder sleeves to achieve OEM-equivalent bore specifications during overhaul and restoration work. The universal design accommodates a broad range of engine platforms, making it an essential component for shops performing multiple rebuild projects. Professional installation requires proper honing and fitting to engine block specifications; verify bore diameter compatibility with your specific engine platform before ordering to ensure correct fitment and optimal performance.