8. Pontiac Firebird 400
Sometimes, manufacturers lie not because they want to impress buyers or hide something, but because they need to sell the car. Back in the late ’60s, GM had a rule that forbade manufacturers to produce cars with more than one horsepower for every 10 pounds of a car’s weight. This rule was aimed at stopping manufacturers from producing insanely overpowered models All of GM`s products and brands had to follow this. The only exception was the Corvette. In 1968, Pontiac introduced the new Firebird with the 400 V8 engine, which rated at 320 hp.
Immediately after introduction, car fans were publicly asking the factory why the new 400 V8 engine in the Firebird rated at 320 HP while the same 400 V8 engine in the GTO was 366 hp. Pontiac didn’t reply. Yet soon the answer came from the insiders of the factory. The new Firebird 400 weighed 3,300 pounds. So in order to make it eligible under the GM one hp per 10-pound rule, Pontiac had to rate the 400 V8 engine at 320 hp. Of course, Pontiac knew their fans would see through this stunt, but they needed to do it in order to sell the new model to the general public.