What does '0.030 inch undersize' mean for these bearings?

This means the bearings are manufactured to be 0.030 inches smaller in diameter than standard size. This is typically used when the engine's crankshaft has been machined down by 0.030 inches during a rebuild to correct wear or damage.

What is the advantage of an aluminum base bimetal bearing?

An aluminum base bimetal bearing offers good conformability, meaning it can adapt to minor imperfections on the crankshaft journal. It also has good embeddability, which helps to absorb small particles that might otherwise cause damage.

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

This is a 5-pair main bearing set, which typically covers all the main bearing positions for the specified Alfa Romeo engines. Always confirm your specific engine's requirements.

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King Engine Bearings 69-94 Alfa Romeo Spider AM-Series 5 Pairs Main Bearing Set

Specifications

Brand: King Engine Bearings
Part #: MB511AM030
UPC: 611500161339

King Engine Bearings 69-94 Alfa Romeo Spider AM-Series 5 Pairs Main Bearing Set

Name: King Engine Bearings 69-94 Alfa Romeo Spider AM-Series 5 Pairs Main Bearing Set
Brand: King Engine Bearings
Price: 73.55 USD
Availability: InStock

$73.55

Only 1 left in stock

King Engine Bearings AM-Series main bearing set. Built with an aluminum base for reliable engine performance.

Key Features

This is a 0.030 inch undersize main bearing set.
Features a bimetal construction with an aluminum base.
Designed for a wide range of Alfa Romeo vehicles including Spider, Alfetta, and Berlina models.
Supports the crankshaft and reduces friction within the engine block.

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Will this fit your vehicle?

Product Details

Built with a bimetal construction featuring an aluminum base, this King Engine Bearings AM-Series main bearing set is designed for durability in a range of Alfa Romeo engines. These bearings are crucial for supporting the crankshaft within the engine block, handling significant loads and reducing friction to keep your engine running smoothly. This set is a solid option for rebuilding or repairing the engine in vehicles like the Alfa Romeo Spider, Alfetta, or Berlina.

The AM-Series uses an aluminum-based bimetal material, which offers good conformability and embeddability, helping to absorb minor imperfections in the crankshaft journal. This construction helps ensure consistent oil film support, a critical factor in preventing premature wear. This particular set is 0.030 inches undersize, meaning it's intended for crankshafts that have been machined to this specification during an engine rebuild.