Generally, an engine designed for maximum torque and horsepower at high speeds has longer runners than one that provides high torque at lower speeds.

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Engines designed for maximum torque and horsepower at high speeds typically have shorter runners to allow for quicker air flow, while engines that aim for high torque at lower speeds use longer runners to increase air velocity and improve cylinder filling at lower RPMs.

Generally, an Engine Designed for Maximum Torque and Horsepower at High