What does the STDX designation mean for these bearings?

The STDX designation from King Engine Bearings signifies an updated, high-performance bearing design. These are engineered to offer improved durability and performance compared to standard bearings, making them a good choice for builds that may see harder use.

Are these bearings safe for the environment?

Yes, these bearings are constructed with a lead-free composite bi-metal aluminum material. This makes them an environmentally safe option, aligning with modern regulations and concerns.

What other components are typically needed when installing main bearings?

When installing main bearings, it's recommended to also have new main cap bolts or studs, assembly lubricant, and potentially a torque wrench to ensure proper installation. Always refer to your engine's service manual for specific procedures and torque specifications.

King Engine Bearings GM 326/350/389/400 w/ 3in Main (Size STDX) Main Bearing Set

Specifications

Brand: King Engine Bearings
Part #: MB5511HPSTDX
UPC: 611500580376

King Engine Bearings GM 326/350/389/400 w/ 3in Main (Size STDX) Main Bearing Set

Name: King Engine Bearings GM 326/350/389/400 w/ 3in Main (Size STDX) Main Bearing Set
Brand: King Engine Bearings
Price: 186.43 USD
Availability: InStock

$186.43

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King Engine Bearings HP STDX main bearing set for GM 326-400ci engines. Features lead-free composite bi-metal aluminum.

Key Features

Fits 1959-1978 Pontiac Bonneville and Catalina, among many other GM vehicles.
Designed for GM 326, 350, 389, and 400 cubic inch engines with 3-inch main journals.
Features a lead-free, environmentally safe composite bi-metal aluminum material.
STDX designation indicates an updated, high-performance bearing design.
Specialized bearing manufacturer with decades of experience.

⚠️ 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 your GM V8, getting the right main bearings is crucial for engine longevity. This King Engine Bearings HP STDX main bearing set is designed for a range of popular GM engines, including the 326, 350, 389, and 400 cubic inch displacements, specifically those with a 3-inch main journal. These bearings are built with a lead-free, environmentally safe composite bi-metal aluminum material, offering a strong and reliable foundation for your crankshaft.

King Engine Bearings has been specializing in bearing technology since 1960, focusing on delivering high-performance components. The STDX designation indicates an updated, high-performance bearing designed to handle the demands of performance builds. This set is a solid option for anyone looking to ensure their engine's rotating assembly is well-supported and durable.

This set is designed to fit a wide variety of GM vehicles from the 1960s through the late 1970s, including popular models like the Pontiac GTO, Chevrolet Corvette, and Buick Skylark. Ensure you verify fitment for your specific application to confirm compatibility.