HEMI stands for hemispherical combustion chamber, Chrysler’s iconic pushrod V8 family spanning three generations. The first-gen FirePower Hemi launched in 1951, followed by the legendary 426 Street Hemi (1964–1971) painted in signature Hemi Orange, dominating NASCAR and drag racing with massive airflow and power potentialDodge. Revived in 2003, modern third-gen Hemis cover 5.7L, 6.4L and supercharged 6.2L Hellcat variants fitted with MDS cylinder deactivation for daily efficiency. Famous for brutal low-end torque and extreme tuning limits, these Mopar powerplants equip Challengers, Chargers and classic muscle restorations worldwide.