The engine has been together for several years with no issues. I did the annual oil change and no pressure on start up. Pulled the distributor and tried priming the pump manually. Pulled the oil filter (dry). Tried partial fill of the oil filter, no luck. Pulled the pick up line and filled the pump, no luck. Pulled the pump apart and found this. Milodon single line pump. Had good pressure before the oil change. Any ideas as to what caused this?

[Linked Image]Untitled by Greg Ault, on Flickr

[Linked Image]Untitled by Greg Ault, on Flickr

[Linked Image]Untitled by Greg Ault, on Flickr

[Linked Image]Untitled by Greg Ault, on Flickr