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Starting at 388 hp, a Speedmaster 383 stroker gained nearly 100 horsepower through three targeted upgrades: CNC-ported heads, a more aggressive cam, and a single-plane intake. Each swap shifted the torque curve higher in the rev range, illustrating the direct relationship between component selection and where an engine makes its power.

Horsepower is torque multiplied by rpm. This dyno series isolates the individual contribution of cylinder heads, camshaft, and intake manifold on a Speedmaster 383 stroker, demonstrating how each component shifts the torque curve and where the trade-offs occur.