Compressor Block - Product Features Forged crank shaft with roller bearing for smooth, long, continuous running Cylinder and Heads auto shell cast with deep finned fins for excess heat absorbsion. Dynamic balance heavy compressor pulley with long blades of fan cools the block. High quality of Piston and piston Ring helps oil control and smooth oil compressions. High quality of Piston and piston Ring helps oil control and smooth oil lubrication.