Cylinder block/barrels are casted in shell moulding process. These shell moulding are done on automatic shell moulding machines, core shooters and further these shell are joined on hydraulically operated shell joining pin closers. The metallurgical and chemical composition is maintained so as to achieve ASTM with G-4000 Grade. The casting of these blocks/barrels are machined in the machine shop equipped with precision CNC turning center, Hydraulically operated NC controlled honing machines, so as to get plateau honing in the bore the hardness of the cylinder barrels varies from 192-220 BHN strictly as per international OE standard. The usage of hardened liners with plateau finish improves the engine life, lowers lube oil consumption and improves fuel efficiency.