ACL 7M8103H-.025 Race-Series Main Bearing Set for 1991-2020 Toyota 1JZ/2JZ I6

Vehicle Fitment

• 1991-2002 Toyota Supra (1JZ-GTE/2JZ-GTE 2.5L/3.0L I6)
• 1991-2020 Toyota Chaser / Mark II / Cresta / Soarer (1JZ-GTE 2.5L I6)
• 1992-2000 Lexus SC300 / GS300 (2JZ-GE 3.0L I6)
• Other Toyota/Lexus platforms using 1JZ/2JZ inline-6 engines - confirm engine variant before installation

Features

• ACL Race-Series tri-metal main bearings for high RPM and load
• +.025 mm oversize for machined or line-honed crankshafts
• Standard oil clearance for optimal lubrication
• Hardened steel backing improves fatigue resistance
• No flash plating on backing for better heat dissipation
• Precision wall thickness for consistent oil clearance
• Designed for naturally aspirated or turbocharged performance engines
• Durable nickel/copper/lead overlay for seizure protection

Specifications

• Part number: 7M8103H-.025
• Bearing size: +.025 mm oversize
• Material: Tri-metal (steel/copper/nickel) with hardened steel backing
• Application: Main bearings for Toyota/Lexus 1JZ/2JZ inline-6 engines
• Upper and lower shell configuration
• Recommended for race, high-performance, or rebuilt engines

Included Components

• 1x full main bearing set (all main journals for crankshaft)

Product Description

The ACL 7M8103H-.025 Race-Series main bearing set is engineered for Toyota and Lexus 1JZ and 2JZ inline-6 engines, specifically for applications where the crankshaft has been machined or line-honed. The +.025 mm oversize ensures a precise fit and maintains optimal oil clearance for high-performance and high-RPM operation.

Constructed from ACL's tri-metal alloy with hardened steel backing, these bearings provide superior fatigue strength, excellent heat dissipation, and reliable seizure protection. The design is suitable for both naturally aspirated and turbocharged engines, making it ideal for race, street performance, or rebuilt engines.

Installation requires verifying crankshaft journal diameter and ensuring proper tunnel clearances to achieve the recommended oil clearance. With ACL Race-Series quality, the 7M8103H-.025 provides durability, consistency, and dependable performance for 1JZ/2JZ engine builds.