The V10 in the SRT10 Ram and the V-10 out of the SRT-10 Viper are the saem engine, they are both rated at 505hp 525 lb/ft torque.
The V10 out of the normal rams are 310 hp and 450 lb/ft torque.
So there are actually 2 different versions of the V-10 available in a truck.
peace
Hog