Revolution Performance Monster Big Bore Kit (139in.) - Bore 4-3/8in. - 11.2:1 Compression - Black - RP201-613W

Revolution 'rospace-grade all-aluminum cylinders with nickel-silicon-carbide electroplated bores which means NO SLEEVING; allows larger bore sizes and less friction for more horsepower, lower temps and a longer lifespan
Monster power in a package thats tested, reliable and, most importantly, really big
Includes Wiseco forged pistons with rings (that are specifically designed for optimal compatibility with Revolution Performances cylinders), wrist pins, circlips and high-performance head and base gaskets
Available in four finishes: natural silver, black, black with highlighted fins or granite (matches the engines of Screamin Eagle models)
Replacement head and base gasket sets available separately