![Chevy GM LS STD Main Bearings [4.8 5.3 5.7 6.0 6.2] making them ideal for withstanding](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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making them ideal for withstanding the rigors of any demanding environment
We have developed a superior line of heads for modern performance enthusiasts
Featuring a boltin EFI downdraft injection system and complete serpentine drive kit
filter element
Aluminum also promotes faster heat dissipation for further cooling of your transmission
Chevy GM LS STD Main Bearings [4.8 5.3 5.7 6.0 6.2] making them ideal for withstandingThese 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.
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