Allow roast to stand at room temperature for 1 hr. In a small dish, mix salt, pepper and garlic; rub mixture evenly onto roast. Place roast on a rack in a roasting pan, rib side down; roast in a preheated 375° oven, uncovered, for 1 hr. Turn off oven, but do not open oven door; leave roast in the oven for 3 hrs. more. Without opening oven door, heat oven to 375°; roast for 45 min. Remove from oven and tent loosely with foil; let stand for at least 15 min. before serving.