Description

BC Brian Crower ProH625+ Connecting Rods for 4B11T Evo X (BC6134)

Firstly, Buy BC6134 ProH625 Rods online at Evomotorparts. Upgrade your Mitsubishi Evolution X engine build with BC6134 ProH625 Rods from Brian Crower. Designed for the Mitsubishi 4B11 engine platform, these premium H-beam connecting rods combine aerospace-grade 4340 chromoly steel with ARP Custom Age 625+ fasteners. They are intended for performance-focused engine builds where strength, precision, and carefully selected components are essential.

Whether you are rebuilding your 4B11T engine, preparing a high-output street car, or assembling a competition-focused setup, the BC6134 ProH625+ connecting rods offer a performance-oriented option for your rotating assembly. Each set includes four connecting rods, CNC machined and finished to meet demanding manufacturing tolerances.

Why Choose BC6134 ProH625 Rods?

Connecting rods transfer force from the pistons to the crankshaft and experience repeated loads throughout the engine’s operating range. As engine output and cylinder pressure increase, selecting appropriate rods and fasteners becomes an important part of engine planning.

Brian Crower manufactures these rods from aerospace-grade 4340 chromoly steel. Each rod is CNC machined and receives a micropolished surface finish. The design also features aluminum, silicon, and bronze piston-pin bushings that are finish honed to precise tolerances.

The ProH625+ design combines this rod construction with ARP Custom Age 625+ fasteners. These bolts are specified by ARP for high clamping performance in demanding engine applications. Consequently, the BC6134 is worth considering for builders who want this particular fastener specification rather than the ARP2000 hardware used with the ProH2K alternative.

BC6134 ProH625 Rods for Mitsubishi Evo X 4B11T

These BC6134 ProH625 Rods are designed for the Mitsubishi 4B11 engine family used in the Lancer Evolution X. They are intended for compatible 4B11T applications, but it is important to verify the exact engine configuration and component dimensions before purchasing.

The connecting rods have a published center-to-center length of 5.659 inches. This dimension affects the geometry of the rotating assembly and must match the selected crankshaft, pistons, and engine configuration. If your engine has aftermarket internals or a stroker setup, confirm compatibility across the complete assembly rather than relying on the vehicle model alone.

Correct fitment also requires checking crankshaft journal dimensions, bearing clearances, piston-pin fitment, and rod orientation. Careful measurement before assembly helps prevent costly errors and supports a properly engineered engine build.

BC6134 ProH625+ Specifications and Features

Review the following manufacturer-listed details when selecting these Brian Crower connecting rods for your Evo X project.

• Brand: Brian Crower
• Part number: BC6134
• Product series: ProH625+
• Engine application: Mitsubishi 4B11 / compatible 4B11T builds
• Rod design: H-beam
• Material: Aerospace-grade 4340 chromoly steel
• Manufacturing: CNC machined
• Surface finish: Micropolished
• Piston-pin bushings: Aluminum/silicon/bronze
• Center-to-center length: 5.659 inches
• Big-end bore: 2.165 inches
• Big-end width: 0.861 inches
• Small-end bore: 0.905 inches
• Small-end width: 0.900 inches
• Published rod weight: Approximately 582 grams per rod
• Fasteners: ARP Custom Age 625+
• Fastener specification: 3/8-inch fasteners; follow the supplied manufacturer’s instructions for assembly
• Quantity: Four connecting rods per set

Always check the manufacturer’s current documentation and the exact parts supplied before assembly. Published dimensions and fastener procedures should be verified against your engine build requirements.

ARP Custom Age 625+ Fasteners

One of the main distinctions of the BC6134 ProH625+ set is its use of ARP Custom Age 625+ rod bolts. ARP rates this fastener material at up to 280,000 psi tensile strength in its product information. This is a material rating, not a guaranteed engine horsepower figure or a promise of performance under every operating condition.

The fasteners are an important part of the rod assembly because they help secure the connecting rod cap under demanding loads. Correct installation is essential. Use the applicable instructions for the supplied bolts, including the specified lubricant and tightening method. Do not substitute a generic torque specification or assume that instructions for ARP2000 bolts also apply to Custom Age 625+ hardware.

The ProH625+ range is aimed at demanding performance applications. However, the suitability of any connecting rod depends on the entire engine combination, operating conditions, assembly quality, and supporting components.

Planning Your Evo X Engine Build

When choosing BC6134 ProH625 Rods, consider the intended use of your vehicle and the requirements of the complete rotating assembly. A road-driven engine, a track car, and a dedicated competition build can have different requirements for component selection and inspection.

Before final assembly, have the crankshaft journals, bearing clearances, piston-pin fit, rod orientation, and rotating-assembly balance checked. If you are using aftermarket pistons or a stroker crankshaft, confirm that the rod length and all relevant dimensions are compatible.

Additionally, connecting rods cannot guarantee engine reliability on their own. The pistons, crankshaft, bearings, lubrication system, fuel system, engine management, and calibration must work together. Professional engine assembly and appropriate tuning remain important for any modified 4B11T engine.

Frequently Asked Questions

What are BC6134 ProH625 Rods?

They are Brian Crower ProH625+ H-beam connecting rods made for compatible Mitsubishi 4B11 engine applications and supplied with ARP Custom Age 625+ fasteners.

How many rods come in a set?

The product is listed as a set of four connecting rods. Confirm the contents of the package with the seller before installation.

What material are the connecting rods made from?

Brian Crower specifies aerospace-grade 4340 chromoly steel, CNC machining, a micropolished finish, and aluminum/silicon/bronze piston-pin bushings.

How do ProH625+ rods differ from ProH2K rods?

The key difference is the fastener specification. The ProH625+ version uses ARP Custom Age 625+ fasteners, while the ProH2K version uses ARP2000 bolts. Confirm the part number to ensure you order the intended version.

Conclusion

Are these rods suitable for every Evo X build? Not automatically. Verify engine application, crankshaft and piston compatibility, clearances, and the intended use of the engine before purchasing. Order BC6134 ProH625+ connecting rods from Evomotorparts for your compatible Mitsubishi Evo X 4B11T performance engine build.

Buy BC6134 ProH625 Rods online at Evomotorparts, Shop Brian Crower H-beam connecting rods with ARP Custom Age 625+ fasteners for Evo X 4B11T builds.