![Chevy GM LS STD Main Bearings [4.8 5.3 5.7 6.0 6.2] These valve covers are TIG-welded](https://cdn.shopify.com/s/files/1/0762/0316/3867/files/PCE325.SBC_412361dc-9b92-4e72-b323-99f89a46ea39.jpg?v=1784401875)
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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
The outer cases made from 8620 Chrome-Nickel-Moly steel and the case hardened for long life and improved strength
and one 3mm spacer
The Speedmaster MidRise Air design features the identical plenum and runner design as the normal MidRise
Available in different bore diameters to suit your specific engine's needs
Chevy GM LS STD Main Bearings [4.8 5.3 5.7 6.0 6.2] These valve covers are TIG-weldedThese 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.
