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The non-VVT 5.7L and 6.1L HEMI engines (2003–2008) built the foundation for modern Mopar performance. With 345–425 hp from the factory and aluminum heads on cast-iron blocks, they powered early Challengers, Chargers, and 300Cs. At Texas Speed & Performance, we supply proven camshaft profiles, cylinder heads, and tuning support to help your early-gen HEMI push well beyond its stock potential.





