Revolution Performance Black Diamond Big Bore Kits are the most powerful, technologically advanced American V-Twin Big Bore Kits in the world! Our state-of-the-art all-aluminum cylinders increase both reliability and horsepower. Comparing our nickel-silicon carbide bores to cast iron cylinders, Revolution Performance big bore kits dissipate heat faster, are lighter in weight, and are 10x more wear resistant! Since our cylinders and premium forged piston are made from the same materials, the engine components heat and expand at the same rate, allowing for tighter tolerances and more power!

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Harley Davidson Motorcycles Harley Davidson Milwaukee 8 Harley Davidson Big Bore Kit Harley Davidson Milwaukee 8 Big bore Kit