ACL Bearings 5M8312HO/S5-STD Race Series Main Bearing Set with +.005in OD

The ACL Bearings 5M8312HO/S5-STD is a high-performance Race Series main bearing set designed for Subaru FA20, FA24, FB20, FB25, and Toyota 4U-GSE boxer engines. This bearing set features standard journal size with an oversized outer diameter of +.005 inches (S5 designation), specifically engineered for housings that have been align-bored or require extra crush for optimal bearing retention.

Key Features:

• Race Series tri-metal construction for maximum durability under high-performance conditions
• Standard journal size with +.005" oversized outer diameter for modified housings
• Increased crush design to securely lock bearings in place and prevent spinning
• Enhanced eccentricity for improved oil film formation and compensation for bore distortion at high RPM
• Hardened steel backing for superior support and heat transfer
• Extended oil grooves on main bearings for improved lubrication and reduced pressure pulsing
• Tight wall thickness tolerances for consistent bearing clearances
• Proven in motorsports applications from drift racing to road racing

ACL Race Series bearings are manufactured in Australia to exacting tolerances and have earned a worldwide reputation for quality and performance in demanding racing applications. These bearings are ideal for high-performance street engines, track cars, and full race builds requiring reliable protection under extreme loads and RPM.