King SI Series Main Bearings (0.026mm Undersize) – Toyota 86 / GR86 & Subaru BRZ (FA20/FA24)

OVERVIEWThe King SI-Series Main Bearing Set (MB5745SI.026) is engineered as an upgraded OE-replacement main bearing set for Subaru FA20/FA24 and Toyota 4U-GSE/FA24D engines requiring a 0.026mm undersize fitment. Constructed with King's lead-free silicon-aluminum bi-metal alloy, this set provides precise oil clearance when assembling engines with micro-polished or light-ground crankshaft main journals. FEATURES Silicon-Aluminum Bi-Metal Alloy: Advanced lead-free material featuring 2.5–3% silicon for exceptional surface hardness and wear resistance. 0.026mm Machinists Undersize: Engineered specifically for crankshaft main journals with micro-polishing or light grinding to achieve exact oil clearance. 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 - 0.026mm Undersize)SPECIFICATIONS Part Number: MB5745SI.026 (MB5745SI 0.026) Series: SI-Series (Bi-Metal OE-Replacement / Upgrade) Material: Aluminum-Silicon Bi-Metal Alloy Journal Size: 0.026mm Undersize 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.