Famous Revolution Performance Big Bore Kits for your Harley-Davidson or Buell motorcycle. Monster kits require case boring service.
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Revolution Performance Bolt-On Big Bore Kits are state of the art aluminum cylinders with our proprietary Nickel Silicone Carbide (NSC) plating. These kits are true bolt-on kits that come complete with everything you need to get more displacement and more power from your American V-Twin.
When bigger isn’t big enough, Revolution offers a Monster solution. Monster kits do require case boring, crankshaft services and CNC porting for proper performance and reliability.