OVERVIEW

The King SI-Series Main Bearing Set (MB5745SI) is engineered as an upgraded OE-replacement main bearing set for Subaru FA20/FA24 and Toyota 4U-GSE/FA24D engines. Constructed with King's lead-free silicon-aluminum bi-metal alloy, this standard-size set delivers increased fatigue resistance, precise oil clearance, and superior journal wear protection over factory bearings for daily-driven and street-performance builds.

FEATURES

• Silicon-Aluminum Bi-Metal Alloy: Advanced lead-free material featuring 2.5–3% silicon for exceptional surface hardness and wear resistance.
• Standard Factory Fitment: Designed for standard un-ground crankshaft main journals to maintain ideal OEM oil clearances.
• Optimized Oil Delivery: Precision-grooved halves ensure reliable oil distribution across main journals under all engine operating temperatures.
• High-Micro Finish Consistency: Manufactured to strict wall thickness tolerances to eliminate clearance variance across main caps.

WHAT IS INCLUDED

• (1) King Engine Bearings SI-Series Main Bearing Set (Complete 10-Piece Main Bearing Set - Standard Size)

SPECIFICATIONS

• Part Number: MB5745SI
• Series: SI-Series (Bi-Metal OE-Replacement / Upgrade)
• Material: Aluminum-Silicon Bi-Metal Alloy
• Journal Size: Standard (STD)
• Warranty: 12 Months
• Installation Time: Professional Engine Assembly Required
• Difficulty: Advanced / Engine Overhaul

FITMENT

• 2013-2020 Toyota 86 / Scion FR-S / Subaru BRZ (ZN6 / ZC6 - FA20 / 4U-GSE Engine)
• 2022-2026 Toyota GR86 / Subaru BRZ (ZN8 / ZD8 - FA24 / FA24D Engine)
• Replaces OEM Part Numbers: 12209AA650, 12209-AA650

WARNING: California Proposition 65 — This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. Intended for competition / off-road use only.