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January 11, 2026, 9:38 AM EST. GM's Vortec engine family, launched in the 1990s for trucks, SUVs and performance variants like the LS line, increased output through vortex-style mixing of fuel and air. The Vortec 4.3-liter V6 delivered about 180 hp; the 5.3-liter small-block V8 peaked near 320 hp and 335 lb-ft; the 8.1-liter big block, used in heavy trucks, produced about 340 hp and 455 lb-ft. Regulatory pressure and reliability concerns weighed on the lineup, prompting GM to pivot in 2014 to the EcoTec3 family, which adds direct injection and variable valve timing for better fuel economy and emissions. The old Vortec used central sequential fuel injection, sending fuel through external tubes; EcoTec3 injects fuel directly into the cylinder, sharpening combustion. The era shifted as standards rose.