XB9/XB12
Performance Kits

Tired of the headache of trying to piece together engine packages that may or may not work the way you planned? We have done the research for you and even packaged the proper components at significant savings over buying them separately! Each of these kits has not only proven itself on the dyno but in the real world also!

For the really BIG horsepower numbers, Stage 3 kits are available in bigger bore sizes. These kits are custom tailored to your needs and budget so call for details

Bolt-On Big Bore Kits
All Revolution™ cylinder and piston kits come complete with our one piece, all aerospace grade aluminum nickel-silicon carbide plated bore cylinders, complete forged piston kit and head and base gasket kit! Our industry leading lifetime warranty applies to all our cylinders! Now come and get’m!
Description Contents Style Price (U.S.) XB12 Bolt-on big bore kit, 1250cc 3-9/16 bore Revolution cylinders 10.5:1 forged pistons, pins, clips, rings head & base gaskets Black 201-520W Silver 201-519 $999.95 XB9 Bolt-on big bore kit, 1050cc 3-9/16 bore Revolution cylinders 10.5:1 forged pistons, pins, clips, rings head and base gaskets Black 201-516 Silver 201-512 $999.95

Monster Big Bore Kits
All require case boring.
Description Contents Styles Price (U.S.) XB12 Big bore kit, 90" (1474cc) **15 Degree Combustion Chamber Machining Required** 3-7/8" bore Revolution cylinders 10.5:1 forged pistons, pins, clips, rings head and base gaskets Black 201-521 Silver 201-522 $999.95 XB9 Big bore kit, 1170cc 3-13/16 bore Revolution cylinders 10.5:1 pistons, pins, clips, rings head and base gaskets Black 201-518 Silver 201-517 $999.95