10. Pontiac 455 V8
After the 421 and 428 V8, both successful big block power plants Pontiac produced in the ’60s, they presented the mighty 455 V8 in 1970. The engine was similar to other General Motors big blocks, but it had a few important differences.
The biggest difference was the stroke, which was longer than the other engines, making Pontiac’s V8 unit more powerful. Even though the power rating was 370 HP, the 500 lb-ft of torque rating was even more impressive. They installed the 455 V8 mostly in luxury and full-size cars, but the GTO and Firebird Trans Am received it as well. They discontinued the engine in 1976, and in its final phase, it only produced 200 HP.