Key Takeaways: Maximizing LT1 engine horsepower safely requires a system-level approach, balancing airflow, fueling, cooling, and calibration to avoid reliability issues. The most impactful upgrades for LT1 horsepower are cylinder heads, camshaft, and supporting fuel and valvetrain components, all brought together with calibrated dyno tuning. Choosing a custom-built LT1 engine over stock upgrades is essential …

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