SERIES 60 SERVICE MANUAL Series 60G exhaust valves for automotive engines are an inconnel based material. They are marked with a "J" on the face of the valve and a "J6-E-5" and a green dot on the top of the stem of the valve. Figure 1-68 Exhaust Valve Identification Beginning with engine model number 6R572448, distinguishing an intake valve from an exhaust valve can be identified by the different size dimples located under the head of the valve, rather then forged lettering. See Figure 1-68and see Figure 1-69. Figure 1-69 Location of Dimples on Intake Valves All information subject to change without notice. (Rev. 2005) 6SE483 0507 Copyright © 2005 DETROIT DIESEL CORPORATION 1-83