Brian Crower Connecting Rods – Mitsubishi 4B11T Evolution X – 5.656 – BC625+ w/ARP Custom Age 625+ F

Aerospace-Grade H-Beam Connecting Rods for High-Boost Mitsubishi 4B11T Evo X Builds

The Brian Crower BRCBC6134 ProH625+ connecting rods are purpose-built for the 2008-2015 Mitsubishi Lancer Evolution X 4B11T engine. Manufactured from aerospace-grade 4340 chromoly steel with a precision CNC-machined H-beam profile, the BRCBC6134 is designed to handle the extreme rod loads of high-boost, high-RPM, and nitrous applications well beyond the factory rod’s limits. Paired with ARP Custom Age 625+ fasteners rated at 280,000 psi tensile strength, these rods are capable of sustaining 250+ horsepower per cylinder reliably.

Key Features

• Aerospace-grade 4340 chromoly steel H-beam construction
• CNC-machined and micropolished surface finish for maximum fatigue resistance
• ARP Custom Age 625+ rod bolts rated to 280,000 psi tensile strength
• Aluminum, silicone bronze pin bushings, finish-honed to exacting tolerances
• 100% Rockwell hardness checked and individually checked for straightness
• 5.659-inch center-to-center length specific to 4B11T Evo X engine geometry
• Rated 250+ horsepower per cylinder for boost, nitrous, and high-RPM applications
• Premium 6AL4V titanium retainers and super-clean chrome silicon spring wire
• Sold as a set of 4 rods with fasteners included
• Made in USA by Brian Crower

Fitment

Specifications

What’s Included

• 4x Brian Crower BRCBC6134 H-beam connecting rods
• ARP Custom Age 625+ rod bolts (pre-installed)

About Brian Crower

Brian Crower has been engineering high-performance engine components from their San Diego, California facility for over 30 years. Their ProH625+ connecting rod series represents the top of their rod lineup, combining aerospace-grade materials with the most capable fastener available from ARP. Brian Crower BRCBC6134 rods are used by professional drag racers, circuit racers, and serious street builds worldwide.

Frequently Asked Questions

What horsepower can the BRCBC6134 Brian Crower Evo X rods handle?

Brian Crower rates the BRCBC6134 ProH625+ rods at 250+ horsepower per cylinder, which equates to over 1,000 horsepower total for a 4-cylinder application. Real-world builds regularly run 600-800 whp on these rods with appropriate supporting modifications.

What makes ARP Custom Age 625+ fasteners better than standard ARP hardware?

ARP Custom Age 625+ fasteners are rated to 280,000 psi tensile strength, which is significantly higher than standard ARP L19 or 8740 hardware. The Custom Age 625+ alloy maintains superior clamping load at high temperatures, making it the preferred fastener for turbo applications where heat cycling is constant.

What is the torque specification for the BRCBC6134 rod bolts?

Brian Crower specifies 65-70 ft-lbs for the 3/8-inch ARP Custom Age 625+ fasteners on the BRCBC6134. Always use ARP moly assembly lube on the threads and under the bolt head when setting torque. Never substitute generic torque values for ARP 625+ hardware.

Do I need to resize the big ends on BRCBC6134 rods after honing?

Brian Crower rods arrive finish-honed to spec. However, it is standard practice to have the big ends resized by a machine shop after installing new rod bolts and before final assembly. This ensures the bore is perfectly round after bolt pre-load, which is critical for bearing clearance and longevity.

Are the BRCBC6134 rods compatible with stroker crankshafts for the 4B11?

Yes. The BRCBC6134 at 5.659-inch center-to-center is commonly used in 4B11T stroker kits. Brian Crower’s own stroker kit (BC0138) uses the BC6134/BRCBC6134 rod paired with a 98mm stroke billet crank, making it a proven combination for 2.5L Evo X builds.

What pin bushings do the BRCBC6134 rods use?

The BRCBC6134 uses aluminum/silicone/bronze composite pin bushings that are finish-honed to exact pin bore tolerances. This bushing design provides excellent wear resistance and heat dissipation for full-floating piston pin setups common in high-performance 4B11T builds.

Do BRCBC6134 rods require any special break-in procedure?

There is no dedicated rod-specific break-in, but the full engine should be broken in per standard performance engine build procedure: vary RPM during the first heat cycle, avoid sustained high-RPM or high-boost operation for the first 500 miles, and perform an oil change after the first heat cycle to remove any assembly debris.

Can the BRCBC6134 rods be used in a stock-block 4B11T at moderate boost?

Yes. The BRCBC6134 is an excellent choice for stock-block 4B11T builds running 400-600 whp. The factory block can support this power level with the right combination of rod, piston, headgasket, and tune, and the BRCBC6134 is well overbuilt for these power targets, providing significant safety margin over OEM rods.

Installation Overview

1. Disassemble the 4B11T engine, remove the crankshaft and clean all journal surfaces
2. Inspect and resize big end bores after installing 625+ bolts to ensure roundness
3. Install piston pins into the rods using a press or pin-fit tool, confirming full-float clearance
4. Apply assembly lube to rod bearings, wrist pin, and ARP 625+ bolt threads and head contact surfaces
5. Install rod and piston assemblies onto the crankshaft, confirm bearing clearance with Plastigauge
6. Torque ARP Custom Age 625+ rod bolts to 65-70 ft-lbs per Brian Crower specification
7. Rotate crankshaft by hand to verify no binding, check side clearance on each rod
8. Complete engine assembly, prime oiling system before first start
9. Break in engine with varied RPM cycles, avoid sustained boost for first 500 miles

WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.