Michigan Motorsports LS Main Crank Bearings .010" Undersize SI-Series | Fits 4.8L 5.3L 5.7L 6.0L 6.2L LS1 LS2 LS3 LQ4 LQ9 L92 L94 L76 L77 Ly6 L96 | Stock & Performance Applications

The Michigan Motorsports LS Main Crank Bearings .010" Undersize SI-Series are designed to deliver durability and precision for both stock and performance LS builds. Manufactured with high-quality bi-metal silicon aluminum materials, these bearings provide superior wear resistance, improved oil clearance, and reduced noise and vibration compared to factory designs. Perfect for use with factory crankshafts that have been turned .010", they ensure proper fitment and reliability in everything from daily drivers to boosted or high-horsepower performance engines. Whether you’re rebuilding an LS1, LS2, LS3, LQ4, LQ9, or other popular GM LS-based engine, these SI-Series main bearings deliver consistent performance and long engine life.

• Engineered for Stock & Performance Builds – Designed for both factory rebuilds and high-performance LS applications, these .010" undersize main bearings ensure reliability and durability whether in a street-driven vehicle or a boosted race build.
• Premium SI-Series Construction – Manufactured from a bi-metal silicon aluminum alloy, these bearings provide exceptional wear resistance, better heat dissipation, and improved surface contact for long-lasting performance under demanding conditions.
• Designed for Turned Crankshafts – Specifically engineered for crankshafts that have been machined .010" undersize, guaranteeing proper oil clearance, reduced friction, and maximum efficiency for your LS engine rebuild.
• Improved Oil Control & Longevity – Enhanced design helps maintain consistent oil film thickness, reducing noise, vibration, and excess oil flow, which extends overall engine life while supporting higher horsepower levels.
• Wide LS Engine Compatibility – Fits a broad range of GM Gen III and Gen IV LS-based V8 engines, including LS1, LS2, LS3, LQ4, LQ9, L92, L94, L76, L77, LY6, and L96 in 4.8L, 5.3L, 5.7L, 6.0L, and 6.2L configurations.