Any feedback? The GYTR Ported Cylinder Head Assembly comes fully assembled and ready to install with no costly core changes or deposits or exchange programs that can add downtime. CNC milling ensures that every head is ported to the maximized design eliminating variances that hand porting can produce. Developed on the flow bench in conjunction with dyno and track testing to ensure the ultimate in performance and durability. Includes GYTR® Performance Camshaft Kit. Also includes stock valve train and cam gears for durability and easy maintenance. GYTR® Head Assemblies are used by Yamaha SX / MX / GNCC®, and ATV race teams. For maximum performance and protection, always use Yamalube® 15W-30 Full Synthetic Oil after installation - two quarts are included with each GYTR® Ported Cylinder Head Assembly.