ACL Main Bearings

2020 Toyota GR Supra 3.0L Inline 6

7M1512H-.025

Overview:

The ACL Main Bearing Set is engineered specifically for the Toyota GR Supra 2020 model, equipped with the BMW B58B30 and S58B30 3.0L inline 6 engines. Designed to provide precise fitment and reliable performance, these main bearings are manufactured to a .025mm (0.001") undersize specification, ensuring optimal clearance and durability. Ideal for enthusiasts and professional rebuilders alike, this bearing set supports engine longevity and smooth operation under demanding conditions.

Whether you are performing an engine rebuild, upgrade, or maintenance, ACL main bearings deliver the quality and consistency required to maintain the integrity of your Supra’s powertrain. Their precise engineering helps reduce friction and wear, contributing to improved engine efficiency and reliability.

Key Features:

ACL main bearings are crafted with advanced technology and materials to meet the rigorous demands of high-performance inline 6 engines. Key features include:

• Precision undersize dimension of .025mm (0.001") for exact crankshaft fitment
• Compatibility with BMW B58B30 and S58B30 3.0L inline 6 engines found in the 2020 Toyota GR Supra
• High-quality bearing materials engineered for durability and wear resistance
• Optimized surface finish to reduce friction and enhance oil film retention
• Manufactured to strict OEM and aftermarket standards for consistent performance
• Designed to withstand high loads and temperatures typical in performance applications
• Complete set includes all main bearings required for a full engine rebuild

Construction & Design:

ACL main bearings are constructed using premium bearing alloys that offer excellent fatigue strength and corrosion resistance. The materials are carefully selected to provide a balance between hardness and conformability, allowing the bearings to adapt to slight imperfections in the crankshaft journal surfaces while maintaining structural integrity.

The undersize specification of .025mm ensures a precise clearance fit, which is critical for maintaining proper oil film thickness and preventing metal-to-metal contact. This precision machining and quality control process guarantees consistent dimensions and reliable performance in demanding engine environments.

Installation & Fitment:

Installation of the ACL main bearing set requires standard engine rebuild procedures, including proper cleaning of bearing surfaces and crankshaft journals. The .025mm undersize bearings are intended for crankshafts that have been machined to this specific dimension, so verification of journal size is essential before installation.

These bearings fit directly into the main bearing caps and engine block of the 2020 Toyota GR Supra equipped with the BMW B58B30 or S58B30 3.0L inline 6 engines, ensuring a seamless replacement or upgrade without the need for modifications.

What's Included:

• Complete set of ACL main bearings sized at .025mm undersize
• Bearings designed for all main journals of the inline 6 engine
• Packaging and documentation for correct identification and installation

Ideal For:

This ACL main bearing set is ideal for automotive technicians, engine builders, and performance enthusiasts who are rebuilding or upgrading the 3.0L inline 6 engines in the 2020 Toyota GR Supra. It is especially suited for applications requiring precise bearing clearances and enhanced durability under high-performance or track conditions.

ACL Race Series is known for performance engine bearings used across motorsports, with rod and main bearing options engineered for durability under high load and heat. Their positioning centers on racing-focused design, metallurgy, and engineering intended to stand up to demanding competition engines.