RevolutionÖ aerospace-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 that's tested, reliable and, most importantly, really big Includes Wiseco forged pistons with rings (that are specifically designed for optimal compatibility with Revolution Performance's cylinders), wrist pins, circlips and high-performance head and base gaskets Replacement head and base gasket sets available separately Made in the U.S.A. All kits require case-boring. For replacement pistons and rings. CYLINDER KIT 100" NAT EVO