Michigan Motorsports LS Main Crank Bearings – SI-Series Standard Size, Fits 4.8L–6.2L LS Engines

Overview

Upgrade or rebuild your LS project with Michigan Motorsports LS Main Crank Bearings in SI-Series standard size. Designed to preserve precise oil clearance and minimize friction, these bearings aim to deliver smooth crankshaft rotation and reliable oil flow across a broad spectrum of LS builds. The tri-metal composition excels at oil retention and heat management, supporting consistent performance from daily driving to higher-demand applications. This set is shaped to complement stock expectations while offering resilience for higher-load scenarios, helping your engine maintain its composure under dynamic driving conditions.

Whether you’re restoring a worn engine, completing a swap, or pursuing a high-horsepower build, these bearings are engineered to work within OEM tolerances while standing up to extra engine loads. The focus is on dependable operation and durable performance, rather than promises of specific results. With proper maintenance and compatible components, you may notice smoother operation and improved lubrication consistency as part of a well-balanced rebuild.

Key benefits and features

• Direct OEM-size replacement to preserve correct oil clearance and reduce wear over time.
• Tri-metal construction for improved heat management and enduring oil retention under load.
• Broad compatibility with Gen 3 and Gen 4 LS engines (4.8L, 5.3L, 5.7L, 6.0L, 6.2L) for natural aspiration or forced induction setups.
• Ideal for engine rebuilds and performance upgrades, offering precision fitment and long-term reliability.
• Designed to support stable crank rotation and consistent lubrication in both daily-driven and demanding applications.

Compatibility and use cases

• Fits a wide range of LS platforms, including common LS family blocks used in daily drivers, swaps, and builds.
• Suitable for stock restorations and moderate-to-high horsepower projects that require dependable main bearings.
• Compatible with naturally aspirated, turbocharged, and supercharged configurations when used with proper ancillary components.
• Part of a balanced rebuild strategy that emphasizes reliability, predictable oil flow, and consistent bearing life.

Real-world expectations

In practical use, these bearings are designed to maintain lubrication quality and reduce friction paths within the main journal area. They support steady engine operation as engine loads fluctuate, and they pair well with other OEM-spec parts if you’re aiming for a cohesive rebuild or a capable LS swap. While benefits like smoother operation and improved oil control are possible outcomes, results depend on overall engine condition, installation accuracy, and complementary components.

If you’re pursuing a rebuild or performance upgrade, this bearing set offers a credible combination of OEM precision and enhanced material characteristics to help your LS engine perform as intended under varied driving scenarios.