Chevy SBC 400 STD Main Bearings The Speedmaster shift selector shaft

The Speedmaster shift selector shaft is built with sturdy

They also offer the potential for improved fuel economy by making the engine more efficient

Featuring a boltin EFI downdraft injection system and complete serpentine drive kit

Couple this Hi-Ram intake with the high flowing LS3 style cylinder heads has outstanding potential for naturally aspirated and forced induction applications

and regulator

Chevy SBC 400 STD Main Bearings The Speedmaster shift selector shaftThese 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.