[GOSFAST]

Hi Joe, appears to be not enough torque on the bolt, this will cause your problem. If it doesn't get enough torque it will eventually work its way out!

What happens is having the correct "tension" on the bolt keeps it in place!

To add to the problem, the OEM dampers are NOT a press fit to begin with, this makes the torque number even more important.

Thanks, Gary in N.Y.

P.S. It's a bit ironic but Pontiac builds share the same characteristics, the OEM damper has always been a "slip-fit", getting the damper bolt up to torque does take a bit of doing! I don't have the OEM torque handy for the Flathead but the Pontiacs must get a minimum of 150# (160# preferred) to do the job! Same size bolt/washer as the Flatheads, being 5/8-18 x 1.750" I believe?