Does this sound correct,,,,,
1963 Pontiac SD-421 Catalina 'Lightweight',,,,,,,,,,,#3608 lbs.
When 'Swiss Cheesed',,,,,,,,,,#3308 lbs.
If 120 holes were punched out the frame, with a net weight removal of 300 lbs. (or 4800 ounces)
The grapefruit sized circle of metal-frame weighed approximately 40 ounces or 2.25 lbs. each.
Your Class Racer Mathmetician,,,,,,,,,