What does 'undersize 0.50in' mean for these bearings?

This means the bearings are manufactured to be 0.050 inches smaller in diameter than standard size. They are intended for use when the engine's crankshaft has been machined down by 0.050 inches to correct wear or runout.

What is the advantage of the SI-Series bimetal construction?

The SI-Series uses an aluminum silicon base, which offers good embeddability and conformability. This helps the bearing adapt to the crankshaft surface while providing solid wear resistance, making it suitable for performance applications.

Does this set include all the main bearings needed for an engine rebuild?

Yes, this is a complete main bearing set designed to replace all the main bearings in the specified Chevrolet 396-502 engines. Always refer to your engine's service manual for specific installation procedures.

Specifications

Brand: King Engine Bearings
Part #: MB556SI050
UPC: 611500441554

King Engine Bearings Chevrolet 396/400/427/502 (Undersize 0.50in) SI-Series Main Bearing Set

Name: King Engine Bearings Chevrolet 396/400/427/502 (Undersize 0.50in) SI-Series Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-chevrolet-396-400-427-502-undersize-0--t14-356353
Price: 44.86 USD
Availability: BackOrder

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King Engine Bearings SI-Series Main Bearing Set for Chevrolet 396-502 engines. Undersize 0.50in.

Key Features

Fits Chevrolet 396, 400, 427, and 502 Gen IV, V, and VI big-block engines.
Main bearing set is 0.050 inches undersize, intended for use with a machined crankshaft.
Features SI-Series bimetal construction with an aluminum silicon base for improved performance and durability.
Designed to fit a wide range of Chevrolet vehicles including the C10 Pickup, Camaro, and Corvette.

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About this part

Product Details

If you're rebuilding the bottom end of your Chevrolet 396, 400, 427, or 502 big-block engine, getting the main bearings right is crucial for long-term reliability. This set from King Engine Bearings is designed to fit a wide range of these popular Chevrolet V8s, including models like the C10 Pickup, Camaro, and Corvette, and is specifically sized at 0.050 inches undersize to accommodate crankshafts that have been machined to match.

These SI-Series bearings feature a bimetal construction with an aluminum silicon base. This material choice helps them handle the demands of performance engines by offering good embeddability and conformability, which means they can adapt to minor imperfections in the crankshaft surface while still providing solid wear resistance. King is a well-known name in engine bearings, and this set is a solid option for anyone looking to restore or enhance their engine's rotating assembly.