Chevy SBC 400 STD Main Bearings Speedmaster billet aluminum spacers provide

Speedmaster billet aluminum spacers provide the benefits of an open carburetor spacer

The shifters have stamped components to ensure smooth

Fits big block Chevy rectangular port cylinder heads on standard deck blocks

and regulator

Chevy SBC 400 STD Main Bearings Speedmaster billet aluminum spacers provideThese 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.