What nickname is commonly used for Pro Stock cars because they have doors?

Pro Stock cars are commonly nicknamed “doorslammers” because they retain recognizable doors and a full-bodied, production-car appearance.

The nickname contrasts Pro Stockers with dragsters, or “rails” and “diggers,” whose narrow tube-frame bodies do not resemble ordinary road cars. It also separates them from Funny Cars, often called “floppers,” which use short-wheelbase chassis and lightweight bodies that only loosely imitate production vehicles.

Pro Stock grew out of production-based Super Stock and became an NHRA class in 1970. The cars look like factory models, but their bodies are highly specialized racing shells and their engines are built for extreme naturally aspirated performance. That is why “factory hot rods” is another common Pro Stock label, even though very little of a modern competition body is literally factory-made.

“Doorslammer” is a broad nickname used in drag racing, not an exclusive technical class name. Still, for an NHRA Pro Stock question, it is the standard answer.