Big Bore Kits

Choose from two different styles: Bolt-On Big Bore Kits or Monster Big Bore Kits



Bolt-On Big Bore Kits


Our bolt-on big bore kits are the best, most reliable way to increase horsepower and torque.

Increases of 25% are common, just by bolting in our cylinders and pistons.

Made from all aluminum construction with state of the art Nickel Silicon Carbide plated bores.

Our cylinders are lighter, with 10x better wear resistance, and with tighter clearances than the OEM cylinders.


Choose your application below:


Victory Motorcycles

HD Twin Cam

HD Sportster

HD Evo

HD Street

Buell XB12

Buell Blast


Monster Big Bore Kits


Monster big bore kits are the ultimate combination of all our parts and services for the biggest, most powerful engine combinations.

We use our all aluminum Nickel Silicon Carbid plated cylinder kits that are so large, the cases must be bored to accept them.

The crankshaft is then balanced for the new components, and our CNC ported heads and cam combo's are highly recommended for ultimate performace.


HD Twin Cam

HD Sportster

HD Evo

Buell XB12

Buell Blast




Millennium Technologies Family of Companies logo Powersports Products & Services:
Millennium Technologies Cylinder Services website link Ballistic Performance Components website link