King MB5745SI SI Main Bearings for 2013-2021 Subaru WRX/BRZ/Crosstrek FA20/FB20

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In Stock: 42

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Product Specification:

SKU:KINGMB5745SI

MPN: MB5745SI

UPC: 611500577734

Weight: 0.9 lb

Inventory: 42

Type: Bearings

Vehicle Fitment

2013-2021 Subaru WRX (VA, Base/Premium/Limited) 2.0L H4 FA20DIT
2013-2020 Subaru BRZ (Base, Premium, Limited) 2.0L H4 FA20
2013-2017 Subaru Crosstrek (Base, Premium, Limited, Hybrid) 2.0L H4 FB20
2012-2022 Subaru Impreza (Base, Premium, WRX) 2.0L H4 FB20/FA20
2012-2022 Subaru Forester/Legacy/Outback XV 2.0L H4 FB20
2013-2021 Toyota 86 / 2013-2016 Scion FR-S 2.0L H4 FA20

Features

SI-Series bi-metal construction (aluminum-silicon base, lead-free)
Designed for medium-load cast crankshaft applications
Upper ½-groove enhances oil distribution across journal
Steel-backed design resists deformation under crank thrust
Standard size (STD) ensures OEM drop-in fit - no machining
Standard flange size (FL STD) for perfect OEM cap fit
Includes a full set of 5 main bearing shells
OEM replacement with 12-month manufacturer warranty

Specifications

Material: Aluminum-silicon bi-metal (lead-free)
Undersize: STD
Bore compatibility (block): 70.425-73.038 mm
Shaft journal range: 67.983-68.009 mm
Shell thickness: 2.512 mm
Width: 17.478 mm
Groove style: ½ upper-groove design
Flange: FL STD (OEM cap fit)
Usage: OEM rebuilds, mild performance

Included Components

5x main bearing shells (STD size)

Product Description

The King MB5745SI SI-Series main bearing set is tailored for Subaru's FA20/FB20 and related FA-platform engines, covering WRX, BRZ, Crosstrek, Impreza, Forester, Legacy, Outback XV, as well as Toyota 86 and Scion FR-S models up to 2021. Crafted with a durable aluminum-silicon bi-metal backing, these STD-size bearings offer ideal clearances for standard rebuilds with no machining required, maintaining OEM-level reliability.

Featuring an upper ½-groove design for superior oil flow, steel support for stability, and FL STD configuration for flawless cap integration, the MB5745SI set is perfect for routine maintenance or mild performance builds. Backed by a 12-month warranty, this OEM-grade replacement delivers known strength, longevity, and peace of mind. Professional installation with torque and clearance checks is recommended.