When replacing your cams use the Ford Racing Boss 302R valve spring kit in the rebuild. The 302R valve spring set has a higher seat pressure than the base valve spring. The valve spring kit can be used with base 5.0L coyote motor head.
 
For more than a century, Ford vehicles have been competing and winning on the track proof positive that a successful race car is more than a collection of performance parts. It is a complete package of race-grade components that are engineered, developed and tested together to deliver a winning combination. Ford engineers and craftsmen led the development of the special components and vehicles that went on to dominate on the track and street.
 
Ford Racing, engineers, craftsmen and many of the best manufacturers in the performance industry collaborate to create and develop the best upgrades for your Ford car or truck. Ford vehicles better than anyone else, which puts Ford Racing in a unique position to help you to realize your car’s performance potential, while maintaining the important balance with the durability, drivability and emissions.