What does the '+1.0mm' sizing mean for these bearings?

The '+1.0mm' sizing means these bearings are designed to fit crankshaft journals that have been machined down by 1.0mm. This is a standard practice during engine rebuilding to ensure a fresh surface for the bearings.

What is the construction of these main bearings?

These main bearings feature a bimetal construction with an aluminum silicon base. This type of material is chosen for its balance of wear resistance and load-carrying capabilities in engine applications.

Are these bearings a direct replacement for all Chevrolet 121 engines?

These bearings are specifically listed for Chevrolet 121 engines. It's always recommended to verify the exact bearing size and type required for your specific engine build, especially if it has been modified or rebuilt previously.

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Specifications

Brand: King Engine Bearings
Part #: MB5531SI1.0
UPC: 611500466021

King Engine Bearings Chevrolet 121 (Size +1.0mm) Main Bearing Set

Name: King Engine Bearings Chevrolet 121 (Size +1.0mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-chevrolet-121-size-1-0mm-main-bearing--t14-770795
Price: 68.79 USD
Availability: BackOrder

$68.79

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King Engine Bearings Chevrolet 121 Main Bearing Set (+1.0mm). Bimetal aluminum silicon construction for your engine.

Key Features

This set includes main bearings for Chevrolet 121 engines.
Bearings are sized +1.0mm for use with machined crankshaft journals.
Constructed with a bimetal design for durability.
Features an aluminum silicon base for reliable performance.

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About this part

Product Details

This is a King Engine Bearings Chevrolet 121 Main Bearing Set, specifically sized at +1.0mm. It includes the main bearings needed for your engine rebuild. These bearings are constructed with a bimetal design, featuring an aluminum silicon base, which is a common and reliable material for engine bearings.

The bimetal construction offers good wear resistance and load-carrying capacity, making it a solid choice for many engine applications. The +1.0mm sizing indicates these bearings are intended for use when the crankshaft journals have been machined down by 1.0mm, a common practice during engine rebuilding to ensure a fresh, smooth surface for the bearings to run on.