What is the STDX size designation?

The STDX size designation means these are standard size bearings, measuring 0.000 inches. This indicates they are intended for a crankshaft that has been machined back to its original factory specifications.

What is King's Tri-Armor™ technology?

Tri-Armor™ is a multi-layered coating system developed by King Engine Bearings. It's designed to reduce friction and improve wear resistance, particularly under the demanding conditions found in performance or heavy-duty engines.

What does the 'LF' in the part number signify?

The 'LF' in the part number stands for 'lower fillet radius'. This means the bearing is designed to work with crankshafts that have a specific, smaller fillet radius at the journal edges, which helps manage stress concentrations.

Specifications

Brand: King Engine Bearings
Part #: MB556TFC6LFSTDX
UPC: 611500619991

King Engine Bearings Chevrolet 396-502 Gen Iv/V/Vi- 6 Lower Fla (Size STDX) Main Bearing Set

Name: King Engine Bearings Chevrolet 396-502 Gen Iv/V/Vi- 6 Lower Fla (Size STDX) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-chevrolet-396-502-gen-iv-v-vi-6-lower--t14-770851
Price: 526.16 USD
Availability: BackOrder

$526.16

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 main bearing set for Chevrolet 396-502 Gen IV/V/VI engines. Size STDX.

Key Features

Fits Chevrolet 396, 427, 454, and 502 cubic inch Gen IV, V, and VI V8 engines.
Features King's Tri-Armor™ technology for improved friction reduction and wear resistance.
STDX size indicates standard 0.000 inch size, for crankshafts machined to factory specs.
LF designation means lower fillet radius, compatible with specific crankshaft designs.
Designed for high-load conditions, suitable for performance and heavy-duty applications.
Provides a strong foundation for engine bottom-end rebuilds.

This main bearing set is designed for Chevrolet 396, 427, 454, and 502 cubic inch V8 engines from the Gen IV, V, and VI generations. Always verify compatibility with your specific engine build and crankshaft specifications.

Secure CheckoutFast Shipping631-982-0042

About this part

Product Details

This is a King Engine Bearings Main Bearing Set, specifically designed for Chevrolet 396, 427, 454, and 502 cubic inch V8 engines from the Gen IV, V, and VI generations. These bearings are crucial for the proper function of your engine's crankshaft, supporting it as it spins and ensuring smooth operation. If you're rebuilding the bottom end of one of these big-block Chevys, a solid set of main bearings is non-negotiable for reliability and performance.

King Engine Bearings uses their unique Tri-Armor™ technology in these bearings, which is a multi-layered coating system. This advanced coating helps to reduce friction and wear, especially under high-load conditions common in performance or heavy-duty applications. The STDX size indicates these are 0.000 inch standard size bearings, meaning they are intended for a crankshaft that has been machined back to its original factory specifications. The 'LF' in the part number signifies a lower fillet radius, which is important for compatibility with crankshafts that have specific fillet designs to manage stress.

When installing these bearings, it's essential to ensure your crankshaft journals are clean and within factory tolerance for the STDX size. Proper lubrication during assembly is also key to protecting the bearing surfaces from initial startup wear. This set is designed to provide a well-built foundation for your engine build, whether it's for a street-driven classic, a towing rig, or a performance project.