Repl. Cylinder Sleeve 4.5625 Bore

The Repl. Cylinder Sleeve 4.5625 Bore is a critical internal engine component designed for precision engine rebuilds and performance restoration. Built by MELLING, a trusted manufacturer in OEM and aftermarket engine parts, this replacement cylinder sleeve serves operators who demand reliability in high-stress applications—from law enforcement training facilities to military equipment maintenance programs. Whether you're restoring vintage small-block engines or maintaining duty weapons systems, a properly fitted cylinder sleeve ensures bore integrity and optimal sealing for consistent performance.

Engineered to exacting tolerances, the 4.5625-inch bore specification ensures precise fit within standard block dimensions and direct compatibility with matching piston and ring assemblies. The sleeve's wall thickness and material composition are designed to resist thermal cycling and maintain dimensional stability under sustained operating temperatures—critical factors in both civilian and military small-engine applications. At 4.23 lbs and measuring 5.75 x 5.75 x 9.75 inches, this component integrates seamlessly into existing engine blocks without modification to core structure, preserving original design characteristics while restoring worn bore surfaces to factory specifications.

This replacement cylinder sleeve benefits mechanics, armorsmiths, and equipment technicians who prioritize bore concentricity and long-term durability over temporary band-aid repairs. Installation requires proper honing and seating to achieve full performance potential; cylinder sleeves work best when paired with a complete piston ring set and valve seals to maximize compression and minimize blowby. Verify your engine block's bore diameter before ordering—the 4.5625-inch specification is engineered for exact fitment and cannot be oversized once installed. For duty weapon systems or critical operational equipment, this MELLING part delivers the precision and reliability you need for dependable field performance.