What is one method by which oil is transported to the valve train components?

Hollow pushrods are indeed a method for transporting oil to the valve train components in an engine. This technique takes advantage of the hollow structure of the pushrods, allowing oil to flow through them from the lifters or the oil gallery directly to the rocker arms and valve mechanisms. As the engine operates, oil is pumped up through these pushrods, ensuring that the valve train receives adequate lubrication, which is essential for reducing friction, wear, and heat generation in these high-speed components.

This method is particularly effective because it facilitates a direct and efficient delivery of oil right where it's needed, enhancing the overall performance and longevity of the valve train assembly. Additionally, using hollow pushrods can help reduce the amount of additional plumbing required for oil delivery, streamlining the engine design.