What does 'SI' mean in the part number MB443SI?

The 'SI' designation in the part number indicates that these are standard size bearings. They are intended for use when the crankshaft journals are still within their original factory specifications and do not require machining for undersize or oversize bearings.

What is the material construction of these bearings?

These bearings feature a tri-metal construction. This material combination is commonly used in engine bearings for its balance of wear resistance and heat management capabilities.

What is the main function of main bearings in an engine?

Main bearings support the crankshaft within the engine block. They maintain proper oil clearance, allowing the crankshaft to rotate smoothly while ensuring adequate lubrication to reduce friction and wear.

King Engine Bearings V6 Main Bearing Set MB443SI

Name: King Engine Bearings Buick/Pontiac/Oldsmobile V6 Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-buick-pontiac-oldsmobile-v6-main-beari-t14-582339
Price: 64.96 USD
Availability: BackOrder

King Engine Bearings Buick/Pontiac/Oldsmobile V6 Main Bearing Set

$64.96

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

King Engine Bearings V6 Main Bearing Set MB443SI. Direct fit.

Key Features

Fits Buick, Pontiac, and Oldsmobile V6 engines.
Standard size (SI) bearings for use on factory spec crankshafts.
Tri-metal construction offers good wear resistance and heat management.
Designed to provide proper oil clearance for crankshaft support.

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Product Details

When you're rebuilding the bottom end of your Buick, Pontiac, or Oldsmobile V6, getting the main bearings right is crucial for engine longevity. This set from King Engine Bearings is designed to replace your worn-out main bearings, ensuring proper crankshaft support and oil clearance. King is known for making well-built bearings that hold up to the demands of a rebuilt engine.

These bearings feature a tri-metal construction, which is a standard for performance and durability in many engine builds. This material combination helps manage heat and wear effectively. The 'SI' in the part number indicates a standard size bearing, meaning it's meant to be installed on a crankshaft that is still within its original factory specifications, without any machining needed for undersize or oversize.

For a successful engine rebuild, always ensure your crankshaft journals are clean and within factory tolerances before installing new bearings. Refer to your vehicle's service manual for specific installation procedures and torque specifications.