King MB4549SI STD SI Main Bearings Ford EcoBoost/Cyclone 3.5L 3.7L V6 2010-2026

Vehicle Fitment

• 2011-2026 Ford F-150 (XL, XLT, Lariat, King Ranch, Platinum, Limited, Police Responder, RWD/4WD, 3.5L Twin-Turbo V6 EcoBoost Gen 1/2)
• 2017-2026 Ford F-150 Raptor (RWD/4WD, 3.5L Twin-Turbo V6 EcoBoost High Output Gen 2)
• 2018-2026 Ford Expedition / Expedition Max (XL, XLT, Limited, Platinum, King Ranch, Timberline, Stealth Edition, RWD/4WD, 3.5L EcoBoost)
• 2013-2026 Ford Transit 150 / 250 / 350 / 350HD (Base, XL, XLT, Medium/High Roof, FWD/RWD, 3.5L EcoBoost)
• 2010-2019 Ford Taurus SHO (Base, FWD, 3.5L Twin-Turbo V6 EcoBoost)
• 2013-2019 Ford Explorer Sport (Base, FWD/AWD, 3.5L Twin-Turbo V6 EcoBoost)
• 2010-2019 Ford Flex (SE, SEL, Limited, FWD/AWD, 3.5L Twin-Turbo V6 EcoBoost)
• 2010-2019 Ford Police Interceptor Sedan / Utility (FWD/AWD, 3.5L EcoBoost / 3.7L Ti-VCT)
• 2018-2026 Lincoln Navigator / Navigator L (Select, Reserve, Black Label, 4WD, 3.5L EcoBoost)
• 2010-2019 Lincoln MKS (Base, AWD, 3.5L Twin-Turbo V6 EcoBoost)
• 2010-2020 Lincoln MKT (Base, AWD, 3.5L Twin-Turbo V6 EcoBoost)
• 2011-2019 Ford Mustang V6 (Base, RWD, 3.7L Ti-VCT Cyclone V6 - naturally aspirated)
• 2011-2016 Ford F-150 (Base, RWD/4WD, 3.7L Ti-VCT Cyclone V6 - naturally aspirated)
• 2011-2018 Ford Edge (SE, SEL, Sport, Titanium, FWD/AWD, 3.7L Ti-VCT Cyclone V6)
• 2011-2015 Ford Explorer (Base, XLT, Limited, Sport, FWD/AWD, 3.7L Ti-VCT Cyclone V6)
• 2010-2012 Lincoln MKZ (Base, AWD, 3.7L Ti-VCT Cyclone V6)

Fitment Notes

• Fits Ford 3.5L EcoBoost (Twin-Turbo, Gen 1 and Gen 2) and 3.7L Ti-VCT Cyclone V6 engines sharing the same main journal diameter - confirm engine code before ordering
• Standard (STD) size - for use on crankshafts at factory main journal diameter; always measure journals before ordering
• SI Series = bi-metal aluminum silicon construction with 2.5-3% silicon; ideal OE-replacement grade for street and daily-driver engine rebuilds
• Does not fit the 2.7L EcoBoost, 3.0L EcoBoost, or 3.5L PowerBoost Hybrid - those engines use different bearing part numbers
• Available in +0.25mm and +0.50mm undersizes under separate part numbers for ground crankshafts
• Ford GT 3.5L EcoBoost uses a dry-sump variant - not confirmed fitment; verify engine build before ordering

Features

• SI Series bi-metal aluminum silicon construction with 2.5-3% silicon for enhanced strength and wear resistance on forged steel crankshafts
• Improved crankshaft finish characteristics reduce microscopic ferrite peaks on reconditioned journal surfaces for a better oil film
• Enhanced oil clearance over OE specification reduces wear and extends crankshaft service life
• Lead-free construction meets current environmental compliance standards
• Full 4-pair set covers all main crankshaft journals in the V6 engine
• Tight wall thickness tolerances ensure consistent oil clearance across all 4 main journals
• Suitable for OE replacement and street rebuild applications on both turbocharged and naturally aspirated V6 platforms
• Manufactured under IATF 16949 and SAE AS 9100 certified quality control

Specifications

• Part Number: MB4549SI
• Size: Standard (STD)
• Series: SI (Bi-Metal Aluminum Silicon - OE Replacement)
• Engine: Ford 3.5L EcoBoost Twin-Turbo V6 (Gen 1 & Gen 2) / Ford 3.7L Ti-VCT Cyclone V6
• Position: Crankshaft Main (Upper and Lower shells)
• Quantity: 4 pairs (8 shells total - full V6 main bearing set)
• Available Sizes: STD / +0.25mm / +0.50mm

Included Components

• 4x Upper Main Bearing Shells
• 4x Lower Main Bearing Shells

Product Description

The King MB4549SI is a standard-size crankshaft main bearing set engineered for Ford's 3.5L EcoBoost Twin-Turbo V6 and the naturally aspirated 3.7L Ti-VCT Cyclone V6 - two closely related engines sharing the same main journal diameter. Covering a wide range of Ford and Lincoln vehicles from 2010 through 2026, including the F-150, F-150 Raptor, Expedition, Transit, Taurus SHO, Explorer Sport, Flex, Navigator, MKS, and MKT, the MB4549SI uses King's SI Series bi-metal aluminum silicon construction with 2.5-3% silicon content for proven OE-replacement durability on street rebuilds.

As a standard-size set, the MB4549SI is designed for 3.5L EcoBoost and 3.7L Cyclone crankshafts at factory main journal diameter and installs without modification. Always confirm the specific engine code and measure crankshaft journals with a precision micrometer before ordering. Undersized variants are available under separate part numbers for crankshafts that have been reconditioned. For higher-output EcoBoost builds or Raptor applications, King's XP or XPC Series in this application offer race-grade tri-metal construction.