ACL 7M8103H-STD Race-Series Main Bearing Set for 1991-2020 Toyota 1JZ/2JZ I6

Vehicle Fitment

• 1991-2020 Toyota Supra (1JZ-GE/1JZ-GTE 2.5L I6 / 2JZ-GE/2JZ-GTE 3.0L I6)
• 1992-2020 Toyota Chaser / Mark II / Cresta / Soarer (1JZ/2JZ I6 engines)
• 1992-2005 Lexus SC300 / GS300 (2JZ-GE 3.0L I6)

Features

• ACL Race-Series tri-metal main bearings designed for high RPM and performance use
• Standard journal size (STD) - fits crankshafts at factory diameter
• Hardened steel backing for improved fatigue resistance and bearing retention
• Elimination of flash plating on bearing backing for better heat transfer
• Increased eccentricity design to assist hydrodynamic oil film formation
• Tight, consistent wall tolerances for reliable oil clearance and durability
• 3/4 groove main bearings in load zones to optimize oil flow and load carrying capacity
• Designed for naturally aspirated and turbocharged performance engine builds

Specifications

• Part number: 7M8103H-STD
• Bearing size: Standard (STD) journal
• Material: Trimetal (steel/copper/nickel overlay) with hardened steel backing
• Application: Main bearings for Toyota/Lexus 1JZ & 2JZ inline-6 engines
• Upper & lower shell design (full set for all main journals)
• Recommended for race, high-performance, or rebuilt engine installations

Included Components

• 1x full main bearing set (covers all main journals)

Product Description

The ACL 7M8103H-STD Race-Series Main Bearing Set is engineered for the Toyota/Lexus 1JZ and 2JZ inline-6 engine series. With its standard-journal sizing, it allows use on crankshafts at factory diameter, providing a high-quality replacement option for performance rebuilds and high-RPM use.

Constructed using ACL's tri-metal overlay and hardened steel backing, this bearing set delivers enhanced fatigue strength, excellent heat management and reliable operation under boosted or high-load conditions. Features such as increased eccentricity and tight wall tolerances help maintain a stable oil film even in aggressive applications.

Installation requires measuring crankshaft journal diameter and ensuring correct tunnel/clearance values for optimal performance and longevity. Ideal for street performance, track use or full race builds, the ACL 7M8103H-STD provides a premium upgrade to OEM main bearings in 1JZ/2JZ engine platforms.