This is the category Engine - Detroit Diesel - 53 Series - 2–53 - Cylinder Heads & Blocks - Valves & Injector Operating Mechanisms - Exhaust Valves. This image leads to a webpage with parts specific to those engines.
Exhaust Valves
 
This is the category Engine - Detroit Diesel - 53 Series - 2–53 - Cylinder Heads & Blocks - Valves & Injector Operating Mechanisms - Rocker Covers & Intermediate Housing Gaskets. This image leads to a webpage with parts specific to those engines.
Rocker Covers & Intermediate Housing Gaskets
 
This is the category Engine - Detroit Diesel - 53 Series - 2–53 - Cylinder Heads & Blocks - Valves & Injector Operating Mechanisms - Cam Followers / Lifter Tappets / Engine Rollers, Pins & Bushings. This image leads to a webpage with parts specific to those engines.
Cam Followers / Lifter Tappets / Engine Rollers, Pins & Bushings