BC Brian Crower 2.71L Stroker Kit for EJ20/EJ25 Subaru WRX and STi

This 2.71L BC stroker kit for the Subaru WRX and STi EJ20 and EJ25 engine platform incorporates a 83mm stroke crank and H-Beam or I-Beam rods. This BC rotating assembly features custom CP pistons, steel alloy wrist pins, full ring pack and locks. ig time power and torque gains. BC ProH2K rods rated to 600 horsepower, BC Pro Series rods rated to 800+ horsepower.

Vehicle Fitment:
2002-2014 Subaru WRX
2004-2021 Subaru STi
(EJ20/EJ25)

Purchase Includes:
4340 billet crank – 83mm stroke
H-Beam or I-Beam rods (5.141 c-to-c)
ARP Fasteners (ARP2000 or Custom Age 625+ Rod Bolts)
Custom pistons (choice of bore/compression)
Wrist Pins, Full Ring Pack, and Locks

Notes:
ACL Race bearings available separately.

Feautres:
• BC 4340 billet steel crankshaft (83mm stroke).
• BC 4340 ProH2K or Pro Series connecting rods.
• CP or JE aluminum forged pistons (any bore size, any compression ratio).
• 5100 Series carbon steel alloy wrist pins. 9310 Series pin upgrade avail.
• Ductile iron plasma top rings, tapered second ring, low tension oil rings.
• Fully system balanced and ready to install. (50% deposit required)

About BC Crankshafts:
BC crankshafts are crafted from aerospace-grade 4340 steel billet. CNC machined on state-of-the-art, 5-axis Mazak Integrex 300-IV CNC machines to exacting tolerances (.0001″), each crankshaft features large radius journals for added rigidity in high horsepower, high boost, high rpm applications. Gun drilled and CNC ground oil holes with smooth surfaces enhance oiling, tear-dropped for added oil scoop, cross-drilled for priority main feeding to the rods, and micro-polished to a mirror finish for optimal bearing lubricity. They are stress relieved, shot peened, magna flux inspected, and nitrided (a multi-step heat treatment) for ultimate performance. Fully profiled counterweights are designed to reduce windage through the crankcase, minimizing oil resistance for better rpm potential.

About BC Connecting Rods:
BC connecting rods are CNC machined from aerospace-grade 4340 steel billet, available in either the European-influenced H-beam or the traditional I-beam design (for certain applications). All rods feature a deep, double-ribbed cap to keep the big end housing bore true at extended rpm, ensuring uniform bearing crush and proper clearances for superior oil supply and maximum load-carrying capacity. H-beam rods include a deep radial groove pin bushing and oil holes at 5 and 7 o’clock, providing critical lubrication to the wrist pin area. I-beam rods feature an oil hole at the 12 o’clock position to keep the pin end bore true at high boost. They are available with ARP2000 fasteners (rated to 210,000 psi) or the ultimate ARP Custom Age 625+ fasteners (rated to 280,000 psi).

Piston Options:
Choose from the top piston brands available: CP or JE, in any desired bore size and compression ratio. Both brands produce custom BC stroker pistons from 2618 T6 high tensile strength forged aluminum. These pistons are computer-designed for strength and minimum weight. Each piston diameter is CNC machined to ensure optimal accuracy and superior grain flow in the forging process. Using 3D modeling software and rigorous Finite Element Analysis, these pistons are manufactured to be the strongest and lightest possible for your application. Custom pistons feature tighter clearances, less noise, better ring seal, and overall enhanced durability. Standard features include pin fit, carbon steel wrist pins, and spiral locks or rail supports depending on the application. Added features include upgraded 9310 alloy wrist pins for reduced flex, lateral gas ports for ring seal assistance, skirt and top coatings, and lightweight design.