Technical Clutch chatter in the '57 Chevy

In video #1 it looks like the throwout bearing has too much play and/or the release fork could rotate during the initial release. Could be that you're getting uneven finger force during that transition. I would try to give the throwout bearing a very tight sliding fit.

Aaron

 

After you check the flywheel for run out mount the indicator to the flywheel and indicate the transmission hole in the bell housing.. then indicate the trans mounting surface on the bell. I generally take a skim cut on the mill to make sure the mounting surface is true before I indicate the bell. I have seen many bell housings... even new ones... that are way out on these measurements and can cause a lot of weird issues. Lots of how to vids out there on this subject.

 

This is a very interesting thread. I hope it results in finally identifying/fixing the problem.