NAMP/IMPS Number (North American Meat Processors Association / Institutional Meat Purchase Specifications) © NAMP 406 Pork Shoulder, Boston Butt, Bone In 406A Pork Shoulder, Boston Butt, Boneless 1406 Pork Boston Butt Steaks 407 Pork Shoulder Butt, Cellar Trimmed, Boneless 408 Read More …