What is the STDX size designation?

The STDX size designation means these bearings are 0.0001 inches larger than a standard size bearing. This slight increase is often used to achieve specific, precise clearances during an engine rebuild, which is critical for proper oil flow and engine health.

What is the pmax black racing line material?

The pmax black racing line is an updated material developed by King Engine Bearings for high-performance applications. It's designed to offer improved durability and performance characteristics compared to previous racing bearing materials, such as the MB4018SI.

Does this main bearing set come with all necessary hardware?

This product is a main bearing set and typically includes only the main bearings themselves. It does not usually include crankshaft bearings, seals, or other installation hardware. Always consult the product packaging or manufacturer's information for a complete list of included components.

Specifications

Brand: King Engine Bearings
Part #: MB5737XPSTDX
UPC: 611500576706

King Engine Bearings General Motors 231 Ci/V6 Ohv (Size STDX) Main Bearing Set

Name: King Engine Bearings General Motors 231 Ci/V6 Ohv (Size STDX) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-general-motors-231-ci-v6-ohv-size-stdx-t14-770925
Price: 236.19 USD
Availability: BackOrder

$236.19

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King Engine Bearings main bearing set for GM 231 Ci V6 OHV engines. STDX size, pmax black racing line.

Key Features

Fits a wide range of General Motors vehicles with the 231 Ci V6 OHV engine.
Features King's pmax black racing line material for improved performance and durability.
STDX size indicates a 0.0001 inch larger than standard bearing for precise clearance.
Designed as an updated option compared to the MB4018SI race bearings.
Well-built main bearing set for engine rebuilding applications.

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About this part

Product Details

If you're rebuilding the bottom end of your General Motors 231 cubic inch V6 OHV engine, a solid set of main bearings is crucial for smooth operation and longevity. These King Engine Bearings main bearing set, part number MB5737XPSTDX, are designed for this specific V6 application, offering a well-built option for your engine build. They fit a wide range of vehicles, including popular models like the Buick LeSabre, Pontiac Bonneville, and Chevrolet Camaro from various years.

This particular set features King's pmax black racing line, which is an updated material compared to their MB4018SI race bearings. This advanced material is intended for high-performance applications, aiming to provide improved durability and performance under demanding conditions. The STDX sizing indicates these bearings are 0.0001 inches larger than standard, which can be important for achieving proper clearances during an engine rebuild. Ensuring the correct bearing clearance is key to oil flow and preventing premature wear.

When you're putting an engine back together, especially one that will see spirited driving, using well-made components like these King main bearings makes a difference. Always refer to your vehicle's specific service manual for detailed installation procedures and torque specifications to ensure the job is done right.