Chrysler’s third-generation HEMI engine debuted in 2003, continuing a tradition that extended back to the early 1950s. HEMI engines are named for the hemispherical shape of their chambers, which allows for more efficient combustion and bigger valves. The earliest third-gen HEMI displaced 5.7 liters and was used in ’03 Ram trucks. It had state-of-the-art spark advance and fuel injection systems that made it more efficient than its predecessor, and a 2009 upgrade added variable valve timing (VVT) and displacement along
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