TOMEI VALVE SPRING RNN14 For NISSAN SR 13203R301Brand TOMEI Product Number 13203R301 Compatible Car NISSAN Compatible Engine SR Product Description High quality designed springs is required to transfer the exact movement of the camshaft to the valves at high engine speeds on high performance engines. The TOMEI products are always engineered with precision in mind to suit the user's needs. So with this in mind careful choices in material selection is made with surface coating and other technologies.