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Out of curiosity I wrote to PAC about the relative life expectancy of "race" vs "street" valve springs. Here's what I got back:
Quote:
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You are correct. Springs designed for very aggressive camshaft profiles generally are high stressed springs resulting in a short lifespan. A spring designed for drag race shouldn’t be used in an endurance application or street use.
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Tom
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Wells's law of engine size: If it matters what gear you're in, the engine's too small!
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