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

The 'STDX' designation indicates that these are an undersize bearing set. Specifically, they are 0.040 inches undersize, meaning they are intended for use with a crankshaft that has been machined down by 0.040 inches during an engine rebuild.

What material are these main bearings made from?

These main bearings are made from a bi-metal aluminum material. They also feature a lead-free composite, which is an environmentally safe material chosen for its performance characteristics in engine bearings.

Are these bearings suitable for a stock rebuild or a performance build?

King Engine Bearings specializes in high-performance bearings. The bi-metal aluminum construction and lead-free composite are designed for improved performance and durability, making them suitable for both stock rebuilds and more performance-oriented engine builds.

King Engine Bearings Chrysler 350/361/383/403 (Size STDX) Main Bearing Set

Specifications

Brand: King Engine Bearings
Part #: MB555HPSTDX
UPC: 611500606410

King Engine Bearings Chrysler 350/361/383/403 (Size STDX) Main Bearing Set

Name: King Engine Bearings Chrysler 350/361/383/403 (Size STDX) Main Bearing Set
Brand: King Engine Bearings
Price: 138.68 USD
Availability: InStock

$138.68

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King Engine Bearings Chrysler 350/361/383/403 (Size STDX) Main Bearing Set. High-performance bi-metal aluminum bearings for a wide range of Mopar V8s.

Key Features

Fits a wide range of Chrysler, Dodge, and Plymouth vehicles from the late 1950s through the early 1970s.
Main bearing set designed for Chrysler 350, 361, 383, and 403 cubic inch V8 engines.
STDX size indicates these bearings are 0.040 inch undersize for use with a machined crankshaft.
Constructed from a bi-metal aluminum material for improved performance.
Features a lead-free composite for environmentally safe operation.
Specialized bearing design from a company focused solely on engine bearings since 1960.

⚠️ 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

If you're rebuilding the bottom end of a Chrysler 350, 361, 383, or 403 cubic inch V8, these main bearings from King Engine Bearings are a solid option. King has been specializing in engine bearings since 1960, focusing on supplying well-built parts for various applications, including many classic Mopar vehicles like the Dodge Charger, Plymouth Barracuda, and Chrysler Newport.

This particular set is the STDX size, which is a 0.040 inch undersize bearing set, meaning it's designed for crankshafts that have been machined down by 0.040 inches. They are constructed from a bi-metal aluminum material with a lead-free composite, offering improved performance for high-stress situations. This construction helps ensure consistent oil film control and durability for your engine's rotating assembly.