Valves

Piston Engine Valves

http://aviamech.blogspot.com/2013/02/piston-engine-valves.html

Valve Job Basics

Watch Video  Source: Jafromobile

How to Remove and Replace Valves in a Cylinder Head

Watch Video  Source: EricTheCarGuy

Valve Adjustments

Watch Video  Source: TiredIronVideos

Cylinder Head Valve Seat Cutting

Watch Video  Source: Fanshawe Motive Power

Engine Intake and Exhaust Valve Basics

https://www.enginebasics.com/Engine%20Basics%20Root%20Folder/Engine%20Valve%20Basics.html
An article on the basics of engine intake and exhaust valves. How they work. Where they are located and how to improve there flow and make more power and torque

How the Valves Open and Close

https://www.howacarworks.com/basics/the-engine-how-the-valves-open-and-close
An explanation of how engine valves work, including the pushrods, tappets and the difference between OHV and OHC engines.