I had recently sent out a crank for polishing. I have it on the bench and my crank damper bolt is going into the threaded hole kind of tight. Are there different threads fort he small block LA engine? I looked at both the bolt and the hole and cant see any damage. I had this crank for years and seem to think there was an issue years ago, but I am ready to use it now and am not wanting to wrench it in there if it is real tight. I learned to stop and ask years ago. Does anyone know the thread pitch and is there a thread chaser out there somewhere?