If you've watched Garage Squad or any other show on Velocity or Motor Trend TV, you know Bruno Massel. See pics and his description of his 4cylinder Drag car.
That's a serious 4Cyl! I remember seeing a car (Mustang or Pinto or something) that had a 4-Cyl with a huge Turbo on it a couple years ago. The engine looked pretty stout, with a lot of after-market heavy-duty stuff. I wonder how much work has been done to these Ecotecs, they must be pretty impressive.
When we were racing the 6-Cylinder dragster, we looked into using the Mercury Marine 4 cylinder. It is literally a Ford 460 motor, cut in half. Uses the same heads as a big block Ford. Can make big power