What does STDX size mean for these main bearings?

The STDX designation indicates that these main bearings are 0.040 inch undersize. This means they are intended for use when the crankshaft journals have been machined down by 0.040 inches during an engine rebuild.

What is PMaxBlack and Radialock technology?

PMaxBlack is King Engine Bearings' material that provides superior load capacity, helping the bearings withstand higher pressures. Radialock is a technology that helps maintain optimal crush height during installation, ensuring a proper fit.

Are these bearings suitable for a performance engine build?

With their superior load capacity and durable tri-metal copper-based construction, these bearings are well-suited for many engine rebuilds, including those with moderate performance enhancements. Always consult your engine builder for specific component recommendations.

Specifications

Brand: King Engine Bearings
Part #: MB557XPSTDX
UPC: 611500530180

King Engine Bearings General Motors 262/267/302/307/327/350 (Size STDX) Main Bearing Set

Name: King Engine Bearings General Motors 262/267/302/307/327/350 (Size STDX) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-general-motors-262-267-302-307-327-350-t14-770861
Price: 101.57 USD
Availability: BackOrder

$101.57

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King Engine Bearings main bearing set for GM 262-350 engines. Size STDX. Well-built for superior load capacity.

Key Features

Fits 134+ vehicle make/model combinations.
STDX size is 0.040 inch undersize for crankshaft journals.
PMaxBlack material offers superior load capacity.
Radialock technology helps maintain optimal crush height.
Constructed with a tri-metal copper-based material.

⚠️ 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 GM V8, getting the main bearings right is critical for engine longevity. This main bearing set from King Engine Bearings is built for a range of popular GM engines, including the 262, 267, 302, 307, 327, and 350 cubic inch displacements. These bearings are designed to handle the demands of an engine rebuild, ensuring smooth rotation of your crankshaft.

King Engine Bearings specializes in creating robust engine bearings, and this set features their PMaxBlack material, which offers superior load capacity. This means the bearings can withstand higher pressures without deforming, which is essential for keeping your engine running smoothly under load. They also incorporate Radialock technology, which helps maintain optimal crush height during installation, ensuring a snug fit and proper oil clearance. The tri-metal copper-based material provides a solid foundation for durability and performance.

This set is a STDX size, meaning it's 0.040 inch undersize. Make sure this is the correct size for your crankshaft journals before ordering. This bearing set fits a wide variety of GM vehicles from the late 70s through the early 2000s, including models like the Chevrolet C1500, Buick Regal, and Cadillac DeVille.