1. Engine Blocks: The main structure of an engine, providing strength and housing for the cylinders.

2. Cylinder Heads: Sealing the top of the cylinders and containing the combustion chambers.

3. Piston Rings: Providing a seal between the piston and cylinder wall to prevent gas leakage.

4. Brake Rotors: Offering high strength and heat resistance, which is crucial for braking performance.

5. Exhaust Manifolds: Withstanding high temperatures and thermal cycling while directing exhaust gases away from the engine.

6. Crankshafts: Converting the linear motion of the pistons into rotational motion to drive the vehicle.

7. Transmission Housings: Protecting and containing the transmission components while providing structural integrity.

8. Differential Cases: Housing the gears that allow for differences in wheel speed during turns.

9. Suspension Components: Such as control arms and spindles, which provide strength and stability.

Cast iron’s durability and ability to absorb heat make it a reliable choice for these critical components in automotive design and engineering.