The Detroit Diesel 8V-71 let this bus hit 280 hp at 2,100 rpm and with a 140-gallon gas tank, it could travel quite a way before having to stop for a fill-up.

Detroit Diesel's 2-stroke diesel engines were eventually replaced with 4-stroke models, but parent company MTU still sells refurbished parts. ... 71, 92 and 149 engines all halted production.

The Detroit Diesel 71-series engine was built from the mid-1930s through the mid-1990s in configurations ranging from an inline-four-cylinder all the way up to a V24.

This joining was officially called the GM 6046 engine, but it was built using a pair of Detroit Diesel 6-71 motors. This twin-Diesel engine was able to produce 410 hp for the World War II-era tank.