ACL BMW S65B40 4.0L V8 .25mm Oversized Main Bearings

When you're rebuilding or refreshing the engine in your 2008-2013 BMW M3, the main bearings are critical. These ACL bearings are built to handle the demands of the S65B40 4.0L V8 engine. They are .25mm oversized, which means they're designed to provide a tighter clearance on the crankshaft. This is often necessary when the crankshaft journals have been machined undersize during a rebuild, or to help reduce excessive clearance in a high-mileage engine. Using the correct size bearings is key to ensuring proper oil pressure and engine longevity.

ACL is a well-known name in engine bearings, and these are a solid option for your M3 build. Make sure you have the correct specifications for your crankshaft before ordering, as using the wrong size bearing can cause serious engine damage.