I just discovered that my new '53 chevy 3800 235 straight 6 dampener pulley was barely hanging on, just long enough for me to buy this beautiful truck. Seemed to have an irregular knocking sound when I was purchasing it last week but it was too late, I already loved the truck and low and behold if you remove the belt you could slide the dampener pulley right off, key was not holding anything. No big deal right, well, they are not made anymore, they are not in stock anywhere, and unless I luck out at a wrecking yard I guess I might have to have this one machined and a sleeve put in. Do I know this will work ? Nope, I'm retired, on SS, not too truck savvy except for recognizing a great classic when I see it and I need to get it running better so I can pull my tractor around to volunteer sites (habitat for humanity). It does run good, just had this annoying knocking sound of the crankshaft pulley wobbling. I do not know yet the extent, if any , of damage to the crankshaft. If anyone has any suggestions I would appreciate it. Thanks, Dave.