King Ford EcoBoost 3.5L/3.7L V6 Main Bearing Set - Size STD - MB4549SI

The King Engine Bearings MB4549SI Main Bearing Set is a standard-size (STD) replacement main bearing set engineered specifically for Ford EcoBoost 3.5L and 3.7L V6 engines. Manufactured by King Engine Bearings — a globally recognized name in precision engine bearing manufacturing — this set is built using a bi-metal aluminum-silicon (SI) material construction designed to meet the demands of these popular Ford V6 applications. Whether you're rebuilding a high-mileage EcoBoost, refreshing a worn bottom end, or performing a precision engine build, the MB4549SI delivers the tolerances and material quality that engine builders rely on.

Key Features & Benefits

• Bi-Metal SI (Aluminum-Silicon) Construction: King's SI material blends aluminum with 2.5–3% silicon, providing a strong, wear-resistant bearing surface. This material profile is well-suited for medium-load engines and is particularly compatible with nodular iron crankshafts common in Ford EcoBoost V6 applications.
• Standard (STD) Size: Designed for use with a standard, unground crankshaft. If your crank journals measure within factory specification and do not require machining, this STD-size set is the correct choice — no guesswork required for a stock rebuild.
• Precision Fit for EcoBoost 3.5L & 3.7L V6: This set is application-specific to the Ford EcoBoost 3.5L and 3.7L V6 engine family, meaning the bearing dimensions, wall thickness, and locating features are engineered to match the OEM block and crankshaft specifications without modification.
• Trusted Engine Builder Brand: King Engine Bearings is a preferred supplier among professional engine builders and rebuilders worldwide. The MB4549SI is a regularly stocked product, reflecting consistent demand from Ford V6 rebuild projects.
• Compatible with a Wide Range of Ford Vehicles: The 3.5L EcoBoost and 3.7L V6 engines power a broad lineup of Ford trucks, SUVs, and cars, making this bearing set relevant for a large installed base of vehicles.

Specifications

• Part Number (MPN): MB4549SI
• SKU: KINGMB4549SI
• UPC: 611500606526
• Size: STD (Standard)
• Material: Bi-metal aluminum-silicon (SI) — aluminum base with 2.5–3% silicon content
• Application: Ford EcoBoost 3.5L V6 / Ford 3.7L V6 Main Bearing Set
• Package Dimensions: Approximately 1.12 x 5.25 x 2.38 inches
• Package Weight: Approximately 16 ounces
• Proposition 65: Yes — California Prop 65 notice applies

Fitment

The King MB4549SI main bearing set fits Ford vehicles equipped with the 3.5L EcoBoost V6 or 3.7L V6 engine. Based on available fitment data, compatible vehicles include:

• Ford Edge (2008–2014 and select additional years) — multiple trims including SE, Limited
• Ford Explorer (2013–2019 and select trims)
• Ford F-150 (2011–2014 and select trims with the 3.5L EcoBoost or 3.7L V6)

This list is not exhaustive. Because the 3.5L EcoBoost and 3.7L V6 engines were used across numerous Ford and Lincoln applications over multiple model years, we strongly recommend verifying fitment against your specific engine displacement, model year, and engine code before ordering. This set is STD size only — if your crankshaft has been ground undersize, you will need an undersize bearing set instead. Contact our team for fitment assistance.

What's in the Box

This listing includes the complete King MB4549SI Main Bearing Set for the Ford EcoBoost 3.5L / 3.7L V6 engine in STD size. The set contains the full complement of main bearing shells required for a complete main bearing replacement on this engine. (King Engine Bearings packages their sets to include all journals — confirm with our team if you have questions about exact shell count for your specific engine.)

Why Buy from ThreePiece.us

• Free Shipping on Every Order: The King MB4549SI ships free to the continental US — no minimum order required.
• Affirm Financing Available: Spread the cost of your engine rebuild over time with Affirm financing at checkout. Lease-to-own options are also available.
• Expert Fitment Support: Our team has served 10,000+ customers and is available to help you confirm the right bearing size, material, and part number for your Ford EcoBoost build. Call us at 813-535-5801 or email sales@threepiece.us.
• Regularly Stocked Product: The MB4549SI is a regularly stocked item at ThreePiece.us, so you won't face long lead times on a standard rebuild part.
• Price Match Guarantee: Found it for less elsewhere? ThreePiece.us offers a price match guarantee on all products.

Frequently Asked Questions

Q: Is this bearing set the right choice if my crankshaft is stock and hasn't been machined?
A: Yes. The STD (standard) size MB4549SI is designed for use with an unmachined, factory-specification crankshaft. If your crank journals are within OEM tolerances and do not require grinding, this is the correct size. If your machinist has ground the crank undersize, you would need a corresponding undersize bearing set — contact us and we can help identify the right option.

Q: Does this set fit both the 3.5L EcoBoost and the naturally aspirated 3.7L V6?
A: Yes — the MB4549SI is listed as fitting both the Ford EcoBoost 3.5L V6 and the 3.7L V6. That said, fitment can vary by model year and vehicle application, so we recommend confirming your engine code and displacement with our team before ordering to ensure compatibility with your specific build.

Q: What material is used in King's SI bearing series, and why does it matter?
A: King's SI bi-metal material combines aluminum with 2.5–3% silicon. According to King Engine Bearings, this construction provides strength and is well-suited for medium-load engines, including those with nodular iron crankshafts. It's a proven material choice for stock and mild-performance Ford EcoBoost rebuilds.

Q: How long will delivery take after I order?
A: The MB4549SI is listed as a regularly stocked product at ThreePiece.us, so standard shipping timelines apply — no extended lead times expected. Free shipping is included on all orders. If you need to confirm current stock status before ordering, contact our team at 813-535-5801.