139" Monster 11.1:1  Perfomance Engine Modifications needed please contact before purchasing.
 
Revolution Performance offers two different type of big bore kits for the Milwaukee 8 engine. Bolt-on big bore kits and monster big bore kits. Bolt-on big bore kits are exactly that, a bolt-on application for your Milwaukee 8 engine. No case boring or additional modifications/upgrades needed. However, additional modifications/upgrades will help make this bolt-on big bore kit a complete package. Monster big bore kits require modifications/upgrades to your engine that include: case boring, crankshaft balancing and CNC cylinder head upgrades.