What does the STDX size mean for these bearings?

The STDX designation means these main bearings are 0.040 inches undersize. This is a common size for engine rebuilding when crankshaft journals have been ground down.

What are these bearings made of?

These bearings are made from a bi-metal aluminum material. They also feature a lead-free composite, making them an environmentally safe option.

Are these bearings suitable for high-performance engines?

These bearings are ideal for medium-load engines. For high-performance or heavy-duty applications, it's always best to consult the manufacturer's specific recommendations for your engine build.

Specifications

Brand: King Engine Bearings
Part #: MB529SISTDX
UPC: 611500418457

King Engine Bearings Ford V8 221 (Size STDX) Main Bearing Set

Name: King Engine Bearings Ford V8 221 (Size STDX) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-ford-v8-221-size-stdx-main-bearing-set-t14-770642
Price: 42.92 USD
Availability: BackOrder

$42.92

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King Engine Bearings Ford V8 221 (Size STDX) Main Bearing Set. Bi-metal aluminum material for medium-load engines.

Key Features

Fits 78+ vehicle make/model combinations.
Main bearing set for Ford V8 221 engines.
STDX size is 0.040 inch undersize.
Constructed with a bi-metal aluminum material.
Suitable for medium-load engines.
Lead-free, environmentally safe composite.

⚠️ 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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About this part

Product Details

This is a King Engine Bearings Main Bearing Set, part number MB529SISTDX. This set includes the main bearings needed for your engine rebuild. These bearings are constructed with a bi-metal aluminum material, making them a solid option for medium-load engines.

King Engine Bearings has been specializing in engine bearings since 1960, focusing on supplying well-built components. The STDX size indicates these bearings are 0.040 inches undersize, which is important to note during your engine assembly. This particular set is designed for a range of Ford V8 engines, including those found in vehicles like the Ford Bronco, Ford F-100, and AC Shelby Cobra models from various years.