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To meet stringent US EPA - TIER IV final emission norms, the diesel engine manufacturers are using various technology approaches. These approaches are varying from advanced in-cylinder combustion strategies to sophisticated exhaust after-treatment technologies. Generally, the proven technology concepts such as Common Rail System (CRS), efficient Turbocharged-Intercooled (TCI), and controlled-cooled EGR along with DOC-DPF in after treatment are used for emission controls. However, this approach will increase the engine cost in addition to the Packaging challenges for the existing vehicle layouts. This paper describes the successful attempt to meet US EPA TIER IV final (<37 kW power category) emission norms on a 2.7 l, Naturally Aspirated (NA) diesel engine for off-highway application. Use of high pressure CRS system, moderate Excess Air Ratio (λ) and optimum engine swept volume selection helped to retain fuel consumption at par with interim TIER IV engine.