What does 'STD Size' mean for these bearings?

STD Size refers to the standard, original equipment manufacturer (OEM) size for the crankshaft journals. These bearings are meant to be installed on stock-sized crankshafts without any machining or grinding.

Are these bearings suitable for high-performance or racing engines?

These bearings are specifically noted as ideal for medium-load engines. For high-performance or racing applications, you would typically look for bearings designed for heavier loads and higher RPMs.

What does the 'Prop 65: Y' note mean?

This indicates that the product contains chemicals known to the State of California to cause cancer or reproductive harm, as required by California's Proposition 65 law. The lead-free composite material is an effort to mitigate these concerns.

King Engine Bearings International 421CI/446CI V8 (STD Size) Crankshaft Main Bearing Set

Specifications

Brand: King Engine Bearings
Part #: MB5599SI
UPC: 611500456268

King Engine Bearings International 421CI/446CI V8 (STD Size) Crankshaft Main Bearing Set

Name: King Engine Bearings International 421CI/446CI V8 (STD Size) Crankshaft Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-international-421ci-446ci-v8-std-size--t14-404267
Price: 95.31 USD
Availability: BackOrder

$95.31

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

King Engine Bearings International 421CI/446CI V8 (STD Size) Crankshaft Main Bearing Set. Lead-free composite bearings for medium-load engines.

Key Features

Fits a wide range of Ford and IHC V8 engines, including 421CI and 446CI displacements.
Standard size main bearing set for precise engine component fitment.
Constructed with a bi-metal aluminum material for durability.
Features a lead-free composite surface, making it an environmentally safe option.
Ideal for medium-load engine applications.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Will this fit your vehicle?

Product Details

King Engine Bearings has been specializing in engine bearings since 1960, aiming to provide the highest quality available. This crankshaft main bearing set is a prime example of that focus, built specifically for Ford and IHC V8 engines, including those with 421 or 446 cubic inch displacements. If you're rebuilding the bottom end of your engine, these standard-size main bearings are designed to handle the demands of medium-load applications.

Constructed from a bi-metal aluminum material, these bearings feature a lead-free composite surface. This makes them an environmentally safe choice while still offering reliable performance for your engine rebuild. They fit a wide range of Ford and International Harvester vehicles, such as the Ford E-350 Econoline, Ford F-250 Super Duty, and Ford Excursion models from the 1980s through the early 2000s.