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Mmfp 1103 09 O Brodix Lh 17 Degree Cylinder Heads Heavier Spring
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"In most cases, the valves and springs included are adequate for the intended use, but there are exceptions to the rule. If you have an aggressive camshaft profile, or a larger camshaft than what the valvesprings are rated, a spring/retainer change will be necessary," said Burcham. He says these heads have a heavier spring due to the boost and 6,500- to 7,000-rpm capabilities of the engine.
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