ACL Main Bearings

2020 Toyota GR Supra - BMW B58B30, S58B30 3.0L Inline 6 Engine

7M1512HX-STD

Overview:

The ACL Main Bearing Set is engineered specifically for the BMW B58B30 and S58B30 3.0L inline 6 engines found in the 2020 Toyota GR Supra. Designed to meet or exceed OEM specifications, this standard bearing set includes an additional .025mm (0.001") oil clearance to optimize lubrication and reduce friction under demanding conditions. Ideal for enthusiasts and professionals seeking reliable engine durability and smooth operation, these bearings provide a critical foundation for maintaining engine health and performance.

Whether you are performing an engine rebuild, upgrade, or routine maintenance, ACL main bearings offer precision fitment and trusted quality to ensure your Supra’s powerplant runs efficiently and reliably.

Key Features:

ACL main bearings combine advanced materials and manufacturing techniques to deliver dependable performance. Key features include:

• Exact fitment for BMW B58B30 and S58B30 3.0L inline 6 engines in the 2020 Toyota GR Supra
• Standard bearing size with an extra .025mm (0.001") oil clearance for enhanced lubrication
• High-quality bearing materials engineered for durability and wear resistance
• Precision machining to ensure optimal crankshaft support and smooth rotation
• Designed to withstand high loads and thermal stresses typical of performance engines
• Manufactured to meet or exceed OEM specifications for reliable engine operation
• Ideal for both street and track applications requiring dependable engine bearing performance

Construction & Design:

ACL main bearings are crafted from premium bearing alloys selected for their strength, fatigue resistance, and compatibility with engine oils. The bearing shells feature a multi-layer design that includes a durable backing layer, a fatigue-resistant intermediate layer, and a conformable overlay to accommodate minor crankshaft imperfections. This construction ensures long service life and consistent performance under varying operating conditions.

The additional .025mm oil clearance incorporated into this bearing set enhances oil film formation, reducing metal-to-metal contact and minimizing wear. This slight clearance increase is particularly beneficial in high-performance or rebuilt engines where optimal lubrication is critical.

Installation & Fitment:

Installation of ACL main bearings requires standard engine rebuild procedures. Bearings should be installed with proper lubrication and checked for correct clearance using plastigauge or micrometer measurements. No modifications are necessary as these bearings are designed for direct OEM fitment in the 2020 Toyota GR Supra’s B58B30 and S58B30 engines. Professional installation is recommended to ensure precise bearing clearance and alignment, which are vital for engine longevity and performance.

What's Included:

• Complete set of main bearings for BMW B58B30 and S58B30 3.0L inline 6 engines
• Standard size bearings with extra .025mm oil clearance

Ideal For:

This ACL main bearing set is ideal for automotive enthusiasts, mechanics, and engine builders working on the 2020 Toyota GR Supra equipped with the BMW B58B30 or S58B30 engine. It suits those performing engine rebuilds, upgrades, or maintenance who require reliable, OEM-quality bearings with enhanced oil clearance for improved lubrication and durability. Whether for daily driving, spirited street use, or track applications, these bearings provide a solid foundation for engine reliability and smooth operation.

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.