H-E Parts uses the industry standard Sunnen machines. Proper roundness and surface finish is achieved via a combination between vitrified and diamond abrasive stones and a high lubricity honing oil. A process used in both cylinder liner refinishing and connecting rod reconditioning, the right combinations give our machinists total control of dimensional size and surface finish. We then can verify surface finish geometry using a profilometer. In-cylinder honing, our plateau honing procedures help minimize ring fatigue at startup, minimize oil consumption and provide a durable surface.