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We also decided to install new valvesprings to keep up with the Lunati cam. Summit's kit includes springs, retainers, keepers, and positive valveguide seals. The new retainers allowed us to trash the clunky exhaust valve rotators. However, that did require adding roughly 0.060 to 0.070 inch valvespring shims to compensate for the deeper exhaust spring seats and maintain a 1.800-inch installed height.