What does the 'STDX' size designation mean for these bearings?

The 'STDX' designation means these main bearings are 0.040 inch undersize. This is a common size used when the crankshaft journals have been machined down to correct for wear or damage during an engine rebuild.

What is the advantage of a lead-free composite bearing?

Lead-free bearings are considered more environmentally friendly during manufacturing and disposal. They are engineered to perform without lead, offering a safer alternative while still maintaining high performance characteristics.

Are these bearings suitable for a high-performance engine build?

Yes, these bearings feature an Alecular high-performance composite and are made by King Engine Bearings, a company specializing in high-quality engine bearings. They are designed for demanding applications and are a solid choice for performance builds.

Specifications

Brand: King Engine Bearings
Part #: MB5503HPSTDX
UPC: 611500585746

King Engine Bearings Ford V8 351Ci 5.8L 16V - Cleveland (Size STDX) Main Bearing Set

Name: King Engine Bearings Ford V8 351Ci 5.8L 16V - Cleveland (Size STDX) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-ford-v8-351ci-5-8l-16v-cleveland-size--t14-770740
Price: 145.43 USD
Availability: BackOrder

$145.43

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King Engine Bearings main bearing set for Ford V8 351Ci 5.8L Cleveland engines. Size STDX. These bearings are made with a lead-free composite.

Key Features

Fits 21+ vehicle make/model combinations including Ford Mustang, Mercury Cougar, and DeTomaso Pantera.
Main bearing set for Ford V8 351Ci (5.8L) Cleveland engines.
Size STDX, indicating 0.040 inch undersize.
Constructed with a bi-metal aluminum material.
Features a lead-free, environmentally safe composite.
Utilizes an Alecular high-performance composite for improved operation.

⚠️ 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

When you're rebuilding the bottom end of your Ford V8, especially the 351 Cleveland, you need main bearings you can trust. This set from King Engine Bearings is designed to meet that need. They're specialists in bearings, and this set is built with a bi-metal aluminum material that's lead-free and environmentally safe, making it a solid choice for your engine build. The STDX size indicates they are 0.040 inch undersize, which is important to note for your machine shop and assembly process.

King has been focused on making the best bearings since 1960, and their specialization really shows. This particular set uses an Alecular high-performance composite, which is a step up for demanding applications. These bearings fit a wide range of Ford and Mercury vehicles from the late 60s and early 70s, including popular models like the Ford Mustang and Mercury Cougar, as well as the DeTomaso Pantera. Ensuring you have the right size and type of bearing is crucial for proper oil clearance and engine longevity.