Replacement Cylinder Sleeve 4.000 Bore Dia.

The Replacement Cylinder Sleeve 4.000 Bore Dia. by MELLING is a precision engine rebuild component designed for serious engine builders and mechanics who demand durability and exact tolerances. This cylinder sleeve restores worn or damaged cylinder bores to factory specifications, enabling a complete engine refresh without full block replacement. Whether you're rebuilding a high-mileage engine, repairing cylinder wall damage, or preparing an engine for increased boost or displacement, this sleeve delivers the dimensional accuracy required for proper piston-to-wall clearance and ring seal integrity.

Manufactured to OEM specifications, the replacement cylinder sleeve features a 4.000-inch bore diameter that ensures perfect fitment in compatible engine blocks and maintains critical tolerances for compression and combustion efficiency. MELLING's engineering provides consistent wall thickness and honing surface quality, which directly impacts ring sealing, oil control, and blow-by reduction. The 5.2 x 5.1 x 9.6-inch footprint and 3.1-pound weight reflect a robust, single-cylinder design suitable for inline and V-configuration engines. Proper installation requires precision honing to match piston specifications and careful ring-gap setup to maximize power output and engine longevity.

Engine builders, restoration specialists, and dedicated automotive enthusiasts rely on cylinder sleeves when original bore damage—such as scoring, corrosion, or excessive wear—makes simple reboring impossible or undesirable. This MELLING sleeve is ideal for restoring classic engines, refreshing tired performance builds, or constructing fresh short-blocks for street, race, or marine applications. Proper installation by a qualified machine shop ensures alignment, concentricity, and finish that guarantee reliable compression, consistent ring seal, and years of dependable operation. Always verify bore diameter compatibility with your specific engine block and consult technical documentation before ordering.