Chevrolet ESP 383 2 piece rear main seal 3.750 Cast Steel Crank Small Block Chevy EAGLE ESP cranks are manufactured with the highest quality cast steel material!All Journals are micro polished. Larger chamfer oil holes provide better oiling, magnifluxed and ultrasonic tested, balanced to OEM specifications..092 Radius on rod , main journals , rear seal & snout for increased strenght & still use inexpensive OE bearings!