What is another name for the L-head engine configuration?

The L-head engine configuration is commonly referred to as a flathead engine. This terminology stems from the engine design where the valves are located in the engine block rather than in the cylinder head. In flathead engines, the combustion chamber is formed by the top of the cylinder, leading to a flat appearance, hence the name "flathead."

The unique aspect of the flathead design allows for a simpler engine structure, contributing to easier engine manufacture and maintenance. It is also important to note that this configuration can lead to improved low-end torque due to a better intake charge motion.

While the term "valve-in-block" also describes the L-head design since the valves are indeed situated within the block, "flathead" is the more commonly used name and is recognized widely in both automotive and small engines contexts. The other options, such as pushrod engine, refer to a different aspect of engine design, specifically related to how the valves are actuated, and poppet engine typically describes a broader class of engines that can include designs beyond just the flathead configuration.