Replacement Cylinder Sleeve - 4.000 Bore

The MELLING Replacement Cylinder Sleeve CSL236HP is a precision-engineered engine block component designed for 4.000-inch bore applications. This cylinder sleeve serves as a critical wear surface in high-performance and rebuilding scenarios where the original bore has been damaged, worn beyond specification, or requires resizing. Built from durable cast iron with a 0.125-inch wall thickness, this universal-fit sleeve provides a reliable solution for engine machine shops, rebuilders, and performance technicians who demand exact dimensional tolerances and long-term reliability.

The CSL236HP features a 6.250-inch height and 4.253-inch outer diameter, specifications that enable proper seating in standard block casting configurations. Cast iron construction provides superior thermal conductivity and wear resistance compared to alternative materials, critical when managing peak combustion pressures and maintaining piston-to-wall clearance over extended engine operation. The 0.125-inch wall thickness represents the industry standard for replacement sleeves, balancing structural strength against material cost and installation accessibility. Proper honing to final piston clearance specifications and correct installation torque are essential for optimal performance and longevity.

This replacement sleeve addresses common rebuild scenarios: restoring engine blocks with damaged original bores, enlarging existing bores to accommodate oversized pistons, and correcting bore concentricity issues. Technicians working on vintage, classic, performance, and marine engines regularly specify MELLING cylinder sleeves for their dimensional accuracy and material consistency. The universal design accommodates multiple engine platforms where bore diameter is the limiting specification parameter.

Cylinder sleeve selection requires precision—incorrect bore sizing leads to piston seizure, blow-by, and catastrophic engine failure. The 4.000-inch bore specification is non-negotiable; verify against original engine documentation and block casting before purchase. Proper installation demands block preparation, precise alignment, and final honing to achieve the correct piston-to-wall clearance (typically 0.0015–0.0025 inches depending on engine design). Weighing 3.15 pounds, this sleeve integrates seamlessly into standard rebuild workflows.