Crane shatters the myth that all spring seats are the same. These spring cups (those that contain the o.d. of the valve springs) and locators (which locate the i.d. of the valve springs) incorporate tapered vertical surfaces to eliminate the spring chafing that can quickly deteriorate and lead to premature failure and breakage of the most expensive valve springs. And when valve springs break, the damage is usually catastrophic. These heat-treated, steel billet items are advised for applications ranging from street performance to professional racing. They come available for specific applications and most popular dimensions of valve springs. Don't chance your engine to an ordinary spring seat.
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