What does the '.50mm' size designation mean for these bearings?

The '.50mm' indicates that these are undersize bearings. They are intended to be used with a crankshaft that has been machined down by 0.50mm (or approximately 0.020 inches) from its original size. This ensures proper oil clearance when a crankshaft has been reground.

Are these bearings suitable for a stock engine rebuild?

These bearings are 0.50mm undersize, meaning they are intended for engines where the crankshaft has been machined. If your crankshaft is still at factory specifications, you would need standard size bearings. Always verify your crankshaft's dimensions before ordering.

What is the primary benefit of using ACL bearings in a performance engine?

ACL bearings are known for their well-built construction, which is important for handling the increased stress and heat in performance or modified engines. Using the correct size and type of bearing ensures proper oil flow and crankshaft support, which is critical for engine longevity.

ACL BMW B58B30/S58B30 3.0L Inline 6 .50mm Oversized Main Bearings

Specifications

Brand: ACL
Part #: 7M1512H-.50

ACL BMW B58B30/S58B30 3.0L Inline 6 .50mm Oversized Main Bearings

Name: ACL BMW B58B30/S58B30 3.0L Inline 6 .50mm Oversized Main Bearings
Brand: ACL
SKU: acl-acl-bmw-b58b30-s58b30-3-0l-inline-6-50mm-oversized-main-bearings-t14-719896
Price: 267.93 USD
Availability: BackOrder

$267.93

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 2016-2018 BMW 340i. ACL 0.50mm undersize main bearings for B58/S58 3.0L engines. Essential for engine rebuilds.

Key Features

Fits 2016-2018 BMW 340i, 2018-2019 BMW X3, and 2020 Toyota GR Supra.
ACL main bearings for BMW B58B30 and S58B30 3.0L inline-6 engines.
These bearings are 0.50mm (0.020 inches) undersize.
Well-built construction for reliable engine performance.
Essential component for engine rebuilds and performance builds.

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Fits these vehicles

BMW 340i 2016-2018
BMW X3 2018-2019
Toyota GR Supra 2020

Product Details

Already running a built B58 or S58 engine? These ACL main bearings are the next piece of the puzzle for your performance build. Designed for the 3.0L inline-6 engines found in vehicles like the BMW 340i, X3, and the Toyota GR Supra, these bearings are crucial for ensuring proper crankshaft support during high-stress operation. They are specifically sized at 0.50mm undersize, which is important if you've had your crankshaft ground to match.

ACL is known for making well-built engine components, and these main bearings are no exception. They are constructed to handle the increased loads and heat that come with modified engines. The 0.50mm undersize means they are intended to be paired with a crankshaft that has been machined down by 0.50mm (or 0.020 inches). This precise sizing is key to maintaining the correct oil clearance, which is vital for engine longevity and performance under demanding conditions.

When rebuilding or heavily modifying your B58 or S58 engine, using the correct main bearings is non-negotiable. These ACL bearings offer a solid option for builders looking for reliable internal engine components. Always refer to your engine's specific service manual for detailed installation procedures and oil clearance specifications.