(Click on the pictures ((they are coooollllllll))) 🙂
On the four stroke engine, the more complicated looking one, if you look at the right of the number toward the circle right above it is called the cylinder block. The one that looks like it is metal is what a cylinder block looks like.
I have learned cylinder block, oil pan, motor stand, pistons (mixes everything up I think) piston heads, piston pins, and piston connectors.
Maybe I will make one of my own.