11. Valve cover and airbox were entirely made of carbon fiber.12. The intake valves were slightly smaller, and cast aluminum valve covers replaced the chrome. 13. All V8 engines received hydraulic roller lifters and new valve cover / head design. 14. The valve cover is made of magnesium to save weight. 15. Later engines featured a PCV system that was molded to the cylinder head valve cover . 16. The 350-4bbl engine received a boost in compression, roller lifters, and new center-bolt valve covers . 17. Other whimsical touches abound : Lego figurines replace the door-lock stanchions and the tire valve covers . 18. Despite the difference in engine displacement, the two bikes share valve angles and magnesium valve covers . 19. The valve cover is powered by gravity. 20. The latter had the red valve cover replaced by a green one, to emphasize the environmental friendliness.
