1. Mix together chili powder, oregano, cumin, and garlic powder. Rub over the surface of pork. Cover and refrigerate 2-24 hours.
2. Grill over medium hot coals, or broil. Turn occasionally. Tenderloins will take 25-20 minutes, pork chops will be ready in 10-15 minutes. Meat thermometer should read 155-160° F. Pork is done when there is still a hint of pink in the center.