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If this were a stock production head, we'd be ready to assemble the castings at this point. However, since this is a performance application, there are a few more checks to make before putting everything together. The first is the spring-seat diameter. High-performance applications require high-performance springs, and for many engines, the diameter of the stock valvesprings is too small. Our heads are being installed with 1.437-inch od dual springs, which generally require the spring pockets of a production head to be machined to a larger diameter, but our Pro Topline heads are made with the larger seats. View Related Article
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