1. Boeing 737-100/200:
- Engine: Pratt & Whitney JT8D-17
- Maximum Takeoff Thrust: Approximately 16,000 pounds of thrust per engine
2. Boeing 737-300/400/500:
- Engine: CFM International CFM56-3
- Maximum Takeoff Thrust: Approximately 22,000 pounds of thrust per engine
3. Boeing 737-600/700/800/900/900ER:
- Engine: CFM International CFM56-7B
- Maximum Takeoff Thrust: Approximately 27,000 pounds of thrust per engine
4. Boeing 737 MAX 7/8/9/10:
- Engine: CFM International LEAP-1B
- Maximum Takeoff Thrust: Approximately 28,000 pounds of thrust per engine
It's important to note that these are approximate values, and the actual thrust and horsepower can vary depending on specific engine configurations, altitude, temperature, and other factors.