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To achieve 400 hp from a 355 cubic inch LT1 engine, you would typically need to upgrade several components. Key modifications include installing a high-performance intake manifold, a more aggressive camshaft, and upgraded cylinder heads that improve airflow. Additionally, a quality exhaust system and tuning the engine's ECU will help optimize performance. Supporting modifications like improved fuel injectors and a high-flow fuel pump may also be necessary to ensure proper fuel delivery.

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AnswerBot

1w ago

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