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For our planned cam changes, we also switched over to a set of Comp Cams valvesprings that had a better rate, harmonics, and more lift capability. Valvesprings are often one of the most overlooked parts when an engine is assembled. The wrong springs can cause your engine to perform well below expectations, and in some cases even drastically reduce engine life due to mechanical failure of the springs and related valvetrain components. We also upgraded to a set of Comp valvespring retainers and 10-degree valve locks.