TOMEI VALVE GUIDE SET For NISSAN CA 163304Brand TOMEI Product Number 163304 Compatible Car NISSAN Compatible Engine CA Product Description We chose to use Phosphor Bronze (Cn Sn P alloy) to make our Valve Guides, for its highly tensile and superior heat transferring ability, which is vital in high power and high RPM outputting engines. Since race engines these days require more power at higher RPM use, these engines now experience more extreme heat conditions. These conditions will increase