Chevy GM LS 010 Main Bearings [4.8 5.3 5.7 6.0 6.2] with the performance and durability

with the performance and durability required to reach the winner's circle

or larger wheels to clear them

stable air flow at any rpm

Speedmaster aluminum pulleys are made from a 356 aluminum alloy that is heat-treated to T-6 specs

from performance street to competition use

Chevy GM LS 010 Main Bearings [4.8 5.3 5.7 6.0 6.2] with the performance and durabilityThese 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.