Mix together soy sauce, garlic, and pepper in a large resealable bag. Place pork chops into the bag and squeeze out most of the air; seal. Marinate in the refrigerator for 12 hours, turning the bag over halfway through.
Set an oven rack about 6 inches from the heat source and preheat the oven's broiler.
Place pork chops onto a broiling pan; discard marinade.
Cook pork chops under the preheated broiler until no longer pink in the center and an instant-read thermometer inserted into the center reads at least 145 degrees F (63 degrees C), about 5 minutes per side. Time will vary depending on the thickness of your chops.