Aluminum GM bellhousing that fits the 11 inch clutch and starter I have. Was used on big blocks and small blocks. Not sure the years but I'm guessing late 60s thru the 70s. They're reproduced now but I was able to find one at Hershey last fall. It was a great score for me. Same guy had a NOS clutch and brake pedal set up with Z bar etc for a late 60s early 70s Nova. One of my favorite cars. I grabbed that too. Can never be too optimistic, even though my wife says I have enough vehicles.