Chevy GM LS STD Main Bearings [4.8 5.3 5.7 6.0 6.2] and you can choose between

and you can choose between plain polished

This upgraded combination elevates the standard in electronic fuel injection

Couple this Hi-Ram intake with the high flowing LS1 style cylinder heads has outstanding potential for naturally aspirated and forced induction applications

They are manufactured from machined steel and offer excellent valve spring location

to increase flow for more performance

Chevy GM LS STD Main Bearings [4.8 5.3 5.7 6.0 6.2] and you can choose betweenThese 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.