Cylinder Sleeve 4.0940 Bore 6.00 in OAL

The Cylinder Sleeve 4.0940 Bore 6.00 in OAL by Melling is a precision engine block restoration component designed for rebuilders, machine shops, and serious automotive enthusiasts tackling worn or damaged cylinder bores. When a block sustains scoring, pitting, or out-of-round bore wear beyond standard oversize piston and ring tolerances, a quality cylinder sleeve restores the block to serviceable condition without costly replacement or boring operations. This Melling CSL179 sleeve bridges the gap between in-frame boring and complete block replacement, making it an economical solution for vintage restorations, performance rebuilds, and engine salvage operations.

This dry-type cylinder sleeve features a nominal 4.0940-inch bore diameter and 6.00-inch overall length, engineered to press-fit into the original cylinder bore with interference fit holding the sleeve securely without epoxy. The 4.0940 bore accommodates standard oversized pistons and rings, allowing you to build to +.040 or +.060 oversize specifications while working within the sleeve's interior dimensions. Melling sleeves are manufactured from close-grained cast iron that resists scuffing and provides superior ring sealing compared to aluminum-block alternatives, ensuring proper oil control and combustion pressure retention across a wide RPM range.

This sleeve is ideal for small-block and big-block engine platforms where bore diameter falls within the 4.09-inch range. Professional machine shops and home builders benefit from Melling's tight dimensional tolerances, which minimize honing time and ensure faster block preparation. Proper installation requires careful bore cleanup and precise press-in using a sleeve driver tool to prevent damage; many shops recommend checking bore diameter and runout before and after installation to confirm proper seating and maintain critical deck height measurements.