Big Block Chevy Rod Bearings, STD size 

General Motors Mahle/Clevite, Tri-Metal Main Bearing Set fits the following:
366 CID 6.0L Chevrolet V8 cylinder 1966-1998,
396 CID 6.6L Chevrolet V8 cylinder 1965-1971,
427 CID 7.0L Chevrolet V8 cylinder 1966-1998,
427 CID 7.0L Chevrolet LPG V8 cylinder 1966-1969,
402 CID 6.6L Chevrolet V8 cylinder 1970-1972,
454 CID 7.4L Chevrolet V8 cylinder 1970-2000,
454 CID 7.4L Chevrolet LPG V8 cylinder 1970-1976,
454 CID 7.4L LP4 Chevrolet LPG V8 cylinder 1999-2000.

Mahle Tri-Metal 77 Main Bearing Set combines the strength of a copper-lead alloy (Bi-Metal) layer with steel backing and an electro-plated Micro Babbitt metal as an overlay.

Mahle Main Bearing Set part number: MS829P (Standard)

The steel backing on the Mahle Tri-Metal 77 Main Bearing Set provides strength and durability. The Bi-Metal Babbitt overlay provides the conformability and Load Capacity. The Third layer - Micro-Babbitt overlay provides the critical surface Embedability & Conformability and has far more forgiveness than bi-metal.

This ideal design has properties not found in many original equipment bearings. In most cases Mahle/Clevite Tri-Metal 77 Bearings are an upgrade over a stock bearing, or three times better.

It takes Three Layers to be Number One, and Mahle/Clevite 77 Tri-Metal Bearings are it !

Engineering quality engine bearings involves a number of interdependent factors. Here is how Mahle/Clevite 77’s Tri-Metal cast copper lead material compares to bi-metal bearings on the most important of these factors:

Seizure Resistance:
Tri-Metal bearings have significantly greater seizure resistance than bi-metal bearings, by as much as 40%.
Load Capacity:
Tri-Metal bearings can withstand much higher loads for longer periods of time as compared to bi-metal bearings, over 60% higher loads.
Embeddability & Conformability:
The overlay on a Tri-Metal bearing offers a far more forgiving surface than bi-metal bearings. This feature may not be as critical during OE assembly as it once was, but it does offer additional protection that can be extremely beneficial in maintaining your engine.
Durability:
Clevite 77’s Tri-Metal bearings not only exceed light vehicle OE durability requirements of 150,000 miles, they also exceed heavy vehicle OE durability requirements of 300,000 miles.
Tolerances:
Because the surface layer of a Tri-Metal bearings adds an additional manufacturing step, Clevite regularly holds wall sizes to within .0005” as compared to a bi-metal that can be held to within .0003”.

Not all Tri-metal engine bearings are the same - so if you want the strongest, highest quality engine bearings, ask for the original Clevite 77 Tri-Metal Engine Bearings.