* Leyland 680 engine: This was a 6.8-litre diesel engine, often producing around 180-220 horsepower.
* Leyland 8.25 engine: A larger 8.25-litre diesel engine, typically offering around 240-280 horsepower.
* Leyland 11-litre engine: This larger 11-litre diesel engine was used in higher-performance models and could produce over 300 horsepower.
However, the Roadrunner also featured DAF engines in later models. These were typically:
* DAF 9.5-litre engine: Producing around 250-300 horsepower.
* DAF 11.6-litre engine: Delivering higher horsepower output, typically over 300 horsepower.
To determine the exact engine size for a specific Leyland DAF Roadrunner, you would need more information, such as the model year, chassis number, or the engine identification plate.
