What does the +0.50mm sizing mean for these bearings?

The +0.50mm sizing indicates that these bearings are slightly larger than standard. This is typically used when the crankshaft journals have been machined down by 0.50mm during a rebuild to correct wear or damage.

What type of engine is this bearing set best suited for?

These bearings are specifically designed for medium-load engines, such as those found in many passenger cars and light trucks from the 1990s and early 2000s. The lead-free composite material is engineered for this type of application.

Does this bearing set come with all the necessary components for installation?

This listing is for the main bearing set only. It includes the main bearings themselves. You will need to ensure you have all other necessary engine rebuilding components, such as oil, gaskets, and seals, before installation.

Specifications

Brand: King Engine Bearings
Part #: MB5557SI0.5
UPC: 611500443305

King Engine Bearings Chevrolet 121Ci/Ln2 134Ci (Size +0.50mm) Main Bearing Set

Name: King Engine Bearings Chevrolet 121Ci/Ln2 134Ci (Size +0.50mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-chevrolet-121ci-ln2-134ci-size-0-50mm--t14-770822
Price: 31.99 USD
Availability: BackOrder

$31.99

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King Engine Bearings Chevrolet 121Ci/Ln2 134Ci (Size +0.50mm) Main Bearing Set. Lead-free composite ideal for medium-load engines.

Key Features

Fits 11+ vehicle make/model combinations.
Features a lead-free, environmentally safe composite material.
Ideal for medium-load engines.
Constructed with bi-metal aluminum material.
Main bearing set is sized +0.50mm.

⚠️ 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

Built with a lead-free, environmentally safe composite material, these main bearings are a solid option for medium-load engines. King Engine Bearings has specialized in creating high-quality engine bearings since 1960, focusing on delivering reliable performance for a wide range of vehicles. This set is specifically designed for Chevrolet 121Ci and 134Ci engines, and it's sized +0.50mm to help account for crankshaft wear.

The bi-metal aluminum construction offers good strength and thermal conductivity, which is important for keeping bearing temperatures in check during operation. These bearings are a direct fit for many popular GM vehicles from the 90s and early 2000s, including models like the Chevrolet Cavalier, S10 pickup, and GMC Sonoma. If you're rebuilding or refreshing an engine from one of these applications, this set offers a well-built replacement to help ensure proper crankshaft support.