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

Main bearings support the crankshaft within the engine block. They are designed to handle the significant loads generated during combustion and rotation, allowing the crankshaft to spin smoothly and efficiently.

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

This set includes the main bearings themselves. It is recommended to consult your vehicle's service manual to determine if any additional installation hardware or specialized tools are required for your specific engine rebuild.

What is Clevite's multi-layer bearing technology?

Clevite's multi-layer technology involves combining different materials to create a bearing that is both strong and able to conform to the crankshaft surface. This design helps to ensure consistent oil film and reduce wear under demanding conditions.

Clevite Main Bearing Set MS667HX - Pontiac 421 428 455 V8

Name: Clevite Pontiac 421 428 455 V8 1963-76 Main Bearing Set
Brand: Clevite
SKU: clevite-clevite-pontiac-421-428-455-v8-1963-76-main-bearing-set-t14-54278
Price: 171.26 USD
Availability: BackOrder

Clevite Pontiac 421 428 455 V8 1963-76 Main Bearing Set

$171.26

On Backorder

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

Clevite Main Bearing Set MS667HX for Pontiac 421, 428, and 455 V8 engines (1963-76).

Key Features

Fits 1963-1976 Pontiac 421, 428, and 455 V8 engines.
Designed for a wide range of Pontiac vehicles including Bonneville, Catalina, Firebird, Grand Prix, and LeMans.
Features Clevite's multi-layer bearing technology for durability and performance.
Supports the crankshaft and ensures smooth engine operation.
Part number MS667HX.

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Will this fit your vehicle?

Product Details

If you're rebuilding the bottom end of your Pontiac 421, 428, or 455 V8 engine from 1963 to 1976, this Clevite Main Bearing Set (MS667HX) is a solid choice. These bearings are crucial for supporting the crankshaft and ensuring it spins smoothly within the engine block. They handle significant loads, so having a well-built set is key to a healthy engine rebuild.

Clevite uses a multi-layer bearing technology that combines strength and conformability. This means the bearings can adapt to the crankshaft's surface while maintaining their structural integrity under pressure. This particular set is designed to fit a wide range of Pontiac V8 applications, including popular models like the Bonneville, Catalina, and Grand Prix from the late 60s through the mid-70s. Proper installation is important; ensure your crankshaft journals are clean and within factory specifications before fitting these bearings.

When you're putting an engine back together, using reliable components like these Clevite main bearings helps ensure your hard work pays off with a smooth-running motor. Always refer to your vehicle's specific service manual for detailed installation procedures and torque specifications.