Small Block Mopar Thrust Bearing issue

[Ken Etter]

As said in an earlier post check the back of the crank. I have had this issue with two different cast cranks. The cranks werent machined deep enough. Inspect it with a light and see if there are any contact points.Something I also do is drill a small hole through the bearing into the main bearing oil hole to provide positive oiling to the thrust. Good luck.