Take the BMW S63 beyond its factory displacement with the ItalianRP 4.7L-5.0L Stroker Kit, developed for high-boost, high-horsepower S63 engine builds.
Built around ItalianRP forged internals, this custom rotating assembly combines increased displacement with components engineered for the cylinder pressure, torque and RPM demands of serious S63 street, drag and race applications.
Choose from 4.7L, 4.8L, 4.9L or 5.0L configurations, along with ItalianRP Gold Line or Platinum Line internals based on the intended power level and use of the engine.
IMPORTANT: Cylinder sleeves are NOT included with this stroker kit.
Required Configuration Options
Please select your kit configuration before adding to the cart.
Kit Tier:
Bore / Displacement:
- 89mm Bore - 4.7L
- 90mm Bore - 4.8L
- 91mm Bore - 4.9L
- 92mm Bore - 5.0L
What's Included
The ItalianRP S63 Stroker Kit is built around a matched forged rotating assembly consisting of:
- Billet Steel Stroker Crankshaft
- 8 Forged Pistons
- 8 Forged Connecting Rods
- Heavy-duty wrist pins
- Performance piston ring packs
- Wire locks
- High-strength connecting rod bolts
- Assembly lubricant
Choose Your ItalianRP Performance Tier
Gold Line
Designed for serious high-horsepower street, roll-racing, drag and weekend track builds where strength and durability are the priorities.
ItalianRP Gold Line components use premium forged materials and heavy-duty construction designed to withstand substantially higher cylinder pressures than factory S63 components.
Gold Line Pistons
- 2618-T6 forged aluminum construction
- CNC-machined design
- Double-bridge internal architecture
- Galvanic coating across the piston crown and upper ring-groove area for additional protection against extreme combustion temperatures
Gold Line Connecting Rods
- ItalianRP 34CrNiMo6 forged steel
- 44-46 HRC hardness
- High-strength construction intended for extreme forced-induction applications
- ItalianRP 2500 Series high-tensile rod bolts
Platinum Line
ItalianRP's highest-specification option for S63 competition engines where maximum strength, reduced rotating mass and high-RPM capability are the priorities.
Platinum Line Pistons
- 2618 aircraft-grade billet aluminum
- Weight-reduced skeletonized construction
- Triple-bridge internal architecture
- Lateral gas porting to improve ring sealing under high cylinder pressure
- Multilayer galvanic thermal-barrier coating across the crown
Platinum Line Connecting Rods
- 35NCD16 motorsport-grade steel
- Cryogenically treated
- 55 HRC hardness
- 2,100 MPa stated yield strength
- Approximately 20% lower reciprocating mass compared with ItalianRP Gold Line rods
- ARP Custom Age 625+ rod bolts
Platinum Line Documentation
- Certified material-quality documentation
- Component mass documentation
Built for Serious S63 Engine Programs
Increasing displacement gives an S63 engine builder another way to increase torque and power without relying solely on additional boost. Depending on the selected bore, this package increases displacement to:
89mm → 4.7L
90mm → 4.8L
91mm → 4.9L
92mm → 5.0L
Final bore size, block preparation, cylinder sleeves, piston-to-wall clearance, compression ratio and complete engine specification should be determined as part of the engine build.
Cylinder Sleeves
Cylinder sleeves are not included.
The larger-bore configurations require proper block preparation and should be treated as part of a complete S63 engine program rather than a simple drop-in rotating assembly.
Need Help Building Your S63?
Going to 4.7L, 4.8L, 4.9L or the full 5.0L S63 requires more than selecting parts from a catalog.
VAC Motorsports can help determine the right ItalianRP configuration for your horsepower target, fuel, turbo system and intended use.
Contact VAC Motorsports before ordering a custom S63 stroker combination.
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