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Vortec is just the name given to the engine... its like how chevy's 2.2L Ecotec, or Cadillacs 4.6L Northstar. Vtec is the name of Honda's variable valve timing technology, not any of its engines. As far as I know there are 3 Vortec engines. a 3.5L I5, a 4.3L I6, and a 5.3L V8....its got nothing to do with turbos or superchargers, its just a model name
hope that helps
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