Cylinder Head Service Kit. KPMI® is proud to introduce full CYLINDER HEAD SERVICE KITS. These kits contain all items to completely refresh and upgrade cylinder heads for popular Dirt / MX and Side x Side models with KPMI's top quality racing valvetrain components. Features: Save time money on your next cylinder head rebuild. One package, everything you need for factory recommended valvetrain service. Double your service life over O.E.M. using KPMI® Valvetrain products. Kitted with value added savings. Kit Includes: Dual Spring Titanium Retainer Spring Kit, which allows for increased valve lift. Top End Gasket Kit by Cometic. KPMI® C630 \ C674 Bronze Standard Valve Guides.