Chevy GM LS STD Main Bearings [4.8 5.3 5.7 6.0 6.2] The outer cases made from

The outer cases made from 8620 Chrome-Nickel-Moly steel and the case hardened for long life and improved strength

Let everyone know you take high performance seriously by flying the Speedmaster name and colors on a Speedmaster banner

These valve covers are TIG-welded and are manufactured to help eliminate distortion and ensure a perfect fit to help protect your valve covers and rocker arms

Speedmaster serpentine belts are designed to keep your accessory drive operating properly

Chevy GM LS STD Main Bearings [4.8 5.3 5.7 6.0 6.2] The outer cases made fromThese Speedmaster main bearings are just what you need to freshen up your engine. Why? They use silicon aluminum bi metal construction. Silicon aluminum is the choice for many of today's engine manufacturers because of its high fatigue strength and superior temperature threshold. Bearing wear is dramatically reduced and the fatigue strength is greatly improved.