keep in mind that forklift engines MUST be governed to around 2600RPM to prevent overspeed damage to the hydraulic pump or excessive ground speed that could result in a crash. This is why the horsepower seems so low. Any more horsepower on that engine would just be lost as wheelspin, it is more than capable of powering the mast quickly within its design limits.

Do not concern yourself too much over the actual engine model number, you will have a more difficult time finding a supplier capable of recognising the engine model number all by itself than you will finding a supplier who can get parts for your engine based on the truck's model and serial number.