I've had this around for years just out of curiosity, anyone want to make a stab at it? It came from a late '70's B-body with 360. The upper holes attach to the exhaust bolt/stud around the port for cylinder 2, the lower hole attaches to the block at the motor mount. I've never been able to come up with a purpose for this part. It weighs over 3lbs and is made of several pieces of stamped steel mig welded together.