I have a 84 C10 4x4 wth 250ci inline 6 and i want to put 350ci v8 are the motor mounts same?
No, the motor mounts are not the same between a 250ci inline-6 and a 350ci V8 in a 1984 C10. The V8 is significantly wider and heavier, requiring different mount locations and designs to properly support it. You'll need a V8-specific motor mount kit designed for your year and model truck.