Chevy SBC 400 STD Main Bearings and best longevity on the

and best longevity on the market

as well as aftermarket control arms

Made from high quality steel and will install without any modifications

1966-72 (1973 non-CA) passenger cars

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

Chevy SBC 400 STD Main Bearings and best longevity on theThese 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.