6. Cadillac 472 V8
In a relentless quest for performance, power, and prestige, Cadillac introduced the 472 V8 in 1968. It was the biggest passenger engine in the world at the time. The new powerplant replaced the 429 V8, and with 50 more CID came new technology and more power. The 1968 to 1970 472 V8 produced 375 HP and 525 lb-ft of torque, more than enough to deliver lively driving dynamics.
Over the years, the power level went down. The last year for the 472 V8 engine was 1974 when it produced just 205 HP. Sadly, it was just a pale shadow of its former self.