Replacement Cylinder Sleeve 4.000 Bore Dia.

The Replacement Cylinder Sleeve 4.000 Bore Dia. by MELLING is an essential component for engine builders and machinists performing cylinder boring and honing operations. When an engine block sustains wear, scoring, or corrosion beyond safe limits, installing a new cylinder sleeve restores the bore to its original specifications without requiring a complete block replacement. This MELLING sleeve is engineered for precision fit and durability, making it the go-to choice for professional rebuilds, performance upgrades, and restoration projects where maintaining OEM specifications is critical.

This 4.000-inch bore diameter sleeve is manufactured to exacting tolerances to ensure proper ring seal and piston clearance—fundamental to engine longevity and performance. MELLING's cast iron construction provides superior heat dissipation and wear resistance compared to aluminum blocks, while the precisely machined interior surface eliminates the micro-roughness that can cause premature ring wear. The sleeve's design accommodates standard piston and ring assemblies, allowing seamless integration into existing engine architectures without custom modifications. At 2.97 lbs and measuring 5.2 x 5.2 x 6.9 inches, this component installs using established cylinder sleeving procedures: boring the block oversize, press-fitting the sleeve, and finish-honing the bore to final specifications.

Mechanics and engine builders rely on MELLING cylinder sleeves when a block's original bore is no longer serviceable—whether due to corrosion pitting, deep scratches from failed piston rings, or separation of the cylinder wall. This 4.000-inch bore diameter sleeve suits small-block engines across numerous platforms where standard oversize clearances are insufficient. Professional shops specify MELLING for OEM-equivalent reliability and the assurance that proper honing and installation yield compression consistency and long-term durability. Whether you're rebuilding a classic car, refreshing a work truck, or assembling a performance engine, this replacement cylinder sleeve delivers the precision fit required for decades of trouble-free operation.