Brian Crower I-Beam Connecting Rods

2011–2025 Mitsubishi Evo X / Mitsubishi 4B11T 2.0L Turbo

Part #: BC6137

Overview

The Brian Crower I-Beam Connecting Rods are engineered for enthusiasts seeking reliable, high-performance internal components for their Mitsubishi Evo X or 4B11T engine. Designed to withstand the rigors of spirited driving, tuning, and increased power levels, these rods provide a proven solution for building a robust bottom end. Whether you're upgrading for daily driving, track days, or high-horsepower applications, these I-Beam rods deliver strength, durability, and consistent performance.

Constructed with precision and quality, the BC6137 rods are ideal for those who prefer the traditional I-Beam design over H-Beam alternatives. They are a popular choice among Mitsubishi tuners and racers who demand reliability and proven engineering in their engine builds. With their strong construction and ARP2000 bolts as standard, these connecting rods help support increased horsepower and torque, ensuring your engine can handle higher boost levels and aggressive tuning setups.

Key Features

Brian Crower I-Beam Connecting Rods incorporate several key features that make them a top choice for Mitsubishi engine builders:

• Manufactured from high-quality steel alloy for exceptional strength and fatigue resistance.
• Traditional I-Beam design offers a proven balance of strength and weight savings, ideal for high-performance applications.
• Standard ARP2000 bolts provide superior clamping force and reliability under high-stress conditions.
• Precision-machined C-to-C length of 5.659 inches ensures accurate piston-to-rod geometry for optimal combustion and performance.
• Big End Bore diameter of 2.165 inches and width of 0.861 inches support high-power builds and increased RPM ranges.
• Piston End Bore of 0.905 inches with a width of 0.900 inches, designed for compatibility with OEM and aftermarket pistons.
• Compatible with factory and aftermarket crankshafts, offering flexibility for custom builds.
• Designed to handle increased power levels, making them suitable for turbocharged setups and high-horsepower tuning.
• Available with optional ARP625+ Custom Age bolts for even greater strength and durability, at an additional cost.

Construction & Design

The BC6137 rods are crafted from premium steel alloy, ensuring durability and resistance to fatigue during high-RPM operation. The I-Beam configuration provides a proven structural design that balances strength and weight, reducing reciprocating mass for improved engine response. Precision machining and quality control guarantee consistent dimensions and fitment, critical for high-performance engine builds. The inclusion of ARP2000 bolts as standard ensures reliable clamping force, supporting higher cylinder pressures and boost levels. For those seeking even greater strength, ARP625+ Custom Age bolts are available as an upgrade, offering enhanced clamping and fatigue resistance for extreme applications.

Installation & Fitment

The Brian Crower I-Beam Connecting Rods are designed as direct replacements for the factory rods in the Mitsubishi 4B11T engine found in the Evo X. Installation requires standard engine assembly procedures, including proper torque specifications for ARP2000 bolts. No modifications or special tools are typically necessary, but professional assembly and balancing are recommended for optimal performance and reliability. These rods are compatible with OEM and aftermarket pistons and crankshafts, making them a versatile choice for custom engine builds.

• Direct bolt-in replacement for factory rods in Mitsubishi Evo X / 4B11T engines.
• Requires standard assembly procedures; professional installation recommended.
• No cutting, drilling, or tuning modifications are necessary beyond standard engine assembly.

What's Included

• Set of high-performance I-Beam connecting rods
• ARP2000 bolts (standard)
• Installation instructions (if provided by manufacturer)

Ideal For

• High-performance Mitsubishi Evo X builds
• Turbocharged engine upgrades
• Enthusiasts seeking reliable, proven connecting rods for increased power
• Engine builders aiming for durability under high RPM and boost conditions