Chevy GM LS STD Main Bearings [4.8 5.3 5.7 6.0 6.2] Speedmaster manufactures these master cylinders

Speedmaster manufactures these master cylinders from quality materials to ensure proper fitment

don't cut corners

Slim line design for when space is at a premium

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

This upgraded combination elevates the standard in electronic fuel injection

Chevy GM LS STD Main Bearings [4.8 5.3 5.7 6.0 6.2] Speedmaster manufactures these master cylindersThese 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.