What does the +0.25mm sizing mean for these bearings?

The +0.25mm sizing indicates that these bearings are slightly larger than standard. This is typically used when the crankshaft journals have been machined down by 0.25mm during an engine rebuild to ensure a proper fit and oil clearance.

Are these bearings environmentally safe?

Yes, these bearings feature a lead-free composite construction, making them an environmentally safe option.

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

This bearing set is specifically designed for medium-load engine applications.

Specifications

Brand: King Engine Bearings
Part #: MB5557SI0.25
UPC: 611500443299

King Engine Bearings Chevrolet 121Ci/Ln2 134Ci (Size +0.25mm) Main Bearing Set

Name: King Engine Bearings Chevrolet 121Ci/Ln2 134Ci (Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-chevrolet-121ci-ln2-134ci-size-0-25mm--t14-770821
Price: 31.99 USD
Availability: BackOrder

$31.99

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King Engine Bearings Chevrolet 121Ci/Ln2 134Ci (Size +0.25mm) Main Bearing Set. A well-built bi-metal aluminum bearing set for medium-load engines.

Key Features

This product is a main bearing set for Chevrolet 121Ci/Ln2 and 134Ci engines.
The bearings are sized +0.25mm, suitable for use on machined crankshaft journals.
Constructed from a bi-metal aluminum material.
Features a lead-free composite for environmental safety.
Designed for medium-load engine applications.

⚠️ 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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Will this fit your vehicle?

About this part

Product Details

When you're rebuilding the bottom end of your engine, you get a set of main bearings with this product. These are bi-metal aluminum bearings, which means they're constructed from a strong aluminum alloy. They're designed for medium-load engines and are a lead-free composite, making them an environmentally safe choice.

King Engine Bearings has been specializing in bearings since 1960, focusing on making them as high-quality as possible. This particular set is sized at +0.25mm, meaning they are built to account for a slight increase in crankshaft journal diameter, often found after machining during an engine rebuild. They fit a wide range of vehicles, including many Chevrolet Cavalier, S10, and GMC Sonoma models from the 1990s and early 2000s.