Bake at 350° for 1 1/2 to 2 hours or until a meat thermometer inserted into thickest portion registers 150°. Let stand 15 minutes before slicing. Baked Pork Butt Roast: Substitute 1 (4- to 5-lb.) boneless pork shoulder roast (Boston butt) for boneless pork loin roast. Prepare recipe as directed in Step 1. Bake at 350° for 4 to 4 1/2 hours or until a meat thermometer inserted into thickest portion registers 180°. Let stand 15 minutes before slicing.