The HEMI logo plastered on modern Dodge cars and Ram trucks promises an increased level of automotive engine performance. But what’s the difference between a hemi and a non-hemi engine? The primary difference is the hemi’s dome-shaped (hemispherical) cylinder head combustion chambers compared to the relatively flat or wedge-shaped combustion chambers present in other cylinder head types. The hemi head design allows larger valves that increase the engine’s internal air-fuel mixture and exhaust flow and a centrally located spark
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