What does the '030' in the part number MB509XP030 signify?

The '030' indicates that these bearings are 0.030 inches undersize. This means they are intended for use with a crankshaft that has been machined down by 0.030 inches to ensure proper clearance and fit during an engine rebuild.

What is the pmax Black construction?

The pmax Black construction refers to King Engine Bearings' racing line of bearings. This tri-metal material is engineered for enhanced strength and durability, making it suitable for high-performance and racing engines that experience higher stresses.

Are these bearings suitable for a stock engine rebuild?

These bearings are part of King's racing line and feature a specific undersize. While they can be used in a performance-oriented stock rebuild, they are primarily designed for engines that have been modified or machined for racing applications. Always ensure your crankshaft is machined to the correct 0.030 undersize specification.

Specifications

Brand: King Engine Bearings
Part #: MB509XP030
UPC: 611500530722

King Engine Bearings Chevrolet 400 V8 Main Crankshaft Bearing Set

Name: King Engine Bearings Chevrolet 400 V8 Main Crankshaft Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-chevrolet-400-v8-main-crankshaft-beari-t14-123092
Price: 111.59 USD
Availability: BackOrder

$111.59

On Backorder

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King Engine Bearings main crankshaft bearing set for Chevrolet 400 V8. The pmax black tri-metal construction is built for racing applications.

Key Features

Fits 73+ Chevrolet and GMC vehicles with a 400 V8 engine.
Main crankshaft bearing set for performance and racing applications.
Features King's pmax Black tri-metal construction for improved strength and durability.
Bearings are 0.030 inch undersize, intended for machined crankshafts.
Designed to handle increased stress and high-RPM operation.

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About this part

Product Details

If you're rebuilding the bottom end of your Chevrolet 400 V8, especially for a performance or racing application, a solid set of main bearings is crucial. These main crankshaft bearings from King Engine Bearings are part of their pmax Black racing line, featuring a tri-metal construction designed to handle the demands of high-RPM operation and increased stress.

The pmax Black material is a step up from standard bearings, offering improved strength and durability for racing scenarios. This set is specifically sized at 0.030 inches undersize, meaning it's intended for crankshafts that have been machined down by that amount to true them up or account for wear. Proper bearing clearance is key to oil flow and preventing premature engine failure, so using the correct size is essential for a successful rebuild.

This bearing set fits a wide range of Chevrolet and GMC vehicles from the 1970s and early 1980s, including popular models like the Chevrolet C10, Impala, and Camaro, as well as GMC C1500 and Jimmy trucks. Always ensure your crankshaft has been properly machined to the 0.030 inch undersize specification before installing these bearings.