[jrvariel48]

Originally Posted by 19Fordy

Are you torquing bolt to specs? Are the threads worn? Is there any type of lock washer or "spring washer" you could use with the bolt.

Here's a very good link to washers that might solve your problem. Lots of great information.
https://www.google.com/search?q=spec...hrome&ie=UTF-8

Read this:
https://vention.io/blogs/best-anti-v...-fasteners-178

Read about "Smart Bolts".
http://www.smartbolts.com/insights/l...nt%20loosening.

First thing I would do is try a brand new Grade 8 bolt.
What engine is in your car?

Lotsa great reading Fordy! The crank is new as was the bolt. I'm looking into the Nord-lock washer system. They seem to hold up to just about any situation.
I was using grade 8 bolts, but no lock washer, just some red lock-tite.
Engine is a blown 1950 8BA.
Thanks Joe