61x pumps can be rebuilt, 60x pumps are disposable. 60x pumps don't fail catastrophically. The bearing races displace which sends balls into the timing chain area. That's the catastrophe. I know a fellow whose SDL oil pump sucked one such bearing. I don't know how it made it through the screen but his insurance paid enough to get the engine rebuilt.

A further problem is when the bearing races displace the lever arm scores the IP timer cam. One more uncheap thing to replace.

To the 60x pump's credit, how many posts are there about 60x pumps not providing enough vacuum?

Sixto
... stay tuned