ACL Race Main Bearings

2005–2010 Scion tC / 2008–2015 Scion xB2 2AZ-FE Engine

5M8412H-.025

Overview:

ACL Race Main Bearings are engineered specifically for the 2AZ-FE engine found in the 2005–2010 Scion tC and 2008–2015 Scion xB2 models. Designed for high-performance and racing applications, these bearings provide the durability and endurance required to withstand the stresses of elevated RPMs and demanding track conditions. Whether you are building a race engine or upgrading your factory components for improved reliability, ACL Race Bearings deliver proven performance and longevity.

With a heritage rooted in over 50 years of engineering and metallurgical expertise, ACL bearings are trusted by racers and engine builders worldwide. These race main bearings offer superior oil clearance options and oversize variants to accommodate engine rebuilds and performance modifications.

Key Features:

ACL Race Main Bearings combine advanced materials and precision manufacturing to meet the rigorous demands of motorsport and high-performance street use. Key features include:

• Track-proven design optimized for high RPM endurance and durability
• Available in standard size, standard size with extra oil clearance, and .25mm oversize options
• Manufactured using premium metallurgy for enhanced wear resistance
• Engineered to maintain optimal oil film thickness under extreme conditions
• Extensive testing and validation in racing environments
• Compatible with stock and modified 2AZ-FE engines in Scion tC and xB2
• Designed to reduce friction and improve engine efficiency
• Produced by ACL, a trusted name in performance engine components

Configuration Options

These ACL Race Main Bearings are available in multiple configurations to suit different engine rebuild requirements:

• 5M8412H-STD: Standard size main bearings for direct replacement
• 5M8412HX-STD: Standard size with extra oil clearance for enhanced lubrication
• 5M8412H-.25: Oversize bearings with .25mm increase for engine reconditioning

Construction & Design:

ACL Race Bearings are crafted from high-quality bearing alloys that deliver exceptional strength and wear resistance. The materials are selected to provide a balance of fatigue resistance and conformability, ensuring reliable performance under the high loads and temperatures typical of racing engines. Precision manufacturing processes guarantee tight tolerances and consistent oil clearance, critical for maintaining proper lubrication and minimizing friction.

The bearing shells feature a durable overlay designed to resist scoring and embed contaminants, extending engine life. ACL’s extensive experience in OEM and aftermarket engine components ensures these bearings meet or exceed the demanding standards of professional engine builders.

Installation & Fitment:

ACL Race Main Bearings are designed as direct replacements for the factory main bearings in the 2AZ-FE engine of the specified Scion models. Installation requires standard engine rebuild procedures, including proper cleaning, measuring, and clearance checking. Depending on the engine condition, selecting the appropriate bearing size—standard, extra oil clearance, or oversize—is essential for optimal performance and longevity.

Note that thrush washers are not included and are sold separately; their use is highly recommended to ensure proper bearing alignment and function.

What's Included:

• Set of ACL Race Main Bearings (standard, extra clearance, or oversize depending on part number)

Ideal For:

These race main bearings are ideal for:

• Engine builders and racers upgrading or rebuilding 2AZ-FE engines
• Performance enthusiasts seeking enhanced durability at high RPMs
• Track and motorsport applications requiring reliable engine internals
• Rebuilds where oversize bearings or increased oil clearance are necessary