BMW N63 / S63 Bully 4.8L Stroker Kit by 5150 AutoSport

Bigger displacement, more torque and more power. Our 5150 Autosport Bully Stroker kit is specifically designed for ultra-high horsepower BMW N63 and S63 applications.

Utilizing CP-Carrillo Pro-Xtreme Forged Pistons and Connecting Rods, as well as the 5150 4340 Billet Steel Crankshaft, this kit has stood up to the tests and trials of high horsepower application time and time again. We only sell you the products that we have used and tested ourselves.

Other teams have applied this kit in Hill Climb, Road Racing, Endurance Racing, Rally, Time Attack, Drag Racing, Roll Racing, and Street applications, all with powerful results.

Benefits of Stroking an Engine

- With higher displacement, your engine will produce greater power and torque, thanks to increased cylinder volume and improved air-fuel mixture combustion

- The longer stroke in the crankshaft increases the leverage on the connecting rods, resulting in increased torque output at lower RPMs

- Improved throttle response

- Increased horsepower

Kit Contents 

- 5150 Autosport 4340 Billet Steel Crankshaft
        - Professionally turned, polished, and coated with anti-wear coating
        - Fully balanced

- CP-Carrillo Pro-Xtreme Forged Pistons**
- CP-Carrillo Piston Wrist Pins 
- CP-Carrillo Piston Rings 
- CP-Carrillo Piston Wire Locks
- CP-Carrillo Pro-Xtreme Connecting Rods

**90 mm Pistons include 5150 Xtreme Duty Cylinder Sleeve Set

Our stroker kit offers displacements of 4.7L to 4.8L, depending on the selected bore size:

89 mm bore size results in a displacement 4700 cc
90 mm bore size results in a displacement 4800 cc

 Please note that the 90mm option requires sleeving the engine block.

Don't see the piston combination you're looking for? Have more questions? Contact our engine build advisors to discuss your next build.