360 hydraulic lifter failure

Hey Uncle Bob, so's you know, depending on the heads, lifters can be fished outta their bores, and carefully pulled thru the opening in the head, using a magnet.
I've got Edelbrock heads, so no such luck. I definitely want to fix it once and be done because intake gaskets and silicon for the china wall don't come cheap.

Just a thought, is it possible the lifter bore is over bore.
I don't think so. I ran a burnishing ball through all of them and it wasn't loose in any of the bores.

Plus, the lifter won't pump up on the bench either so I feel safe in saying there's something wrong with that lifter.

I went around pressed the pushrods and counted 5, maybe 6 lifters that have bled off at least a little. I may disassemble those in hope of a good cleaning putting them in working order to save some broken-in lifters. If not, I'll test the new lifters on the bench and replace the lifters that leaked off with known good ones.

UPS tracking shows the parts arriving today but it also says they're still at the nearest depot to Summit's warehouse 4 hours away. So I'm pretty skeptical. LOL Heck I didn't even know UPS ran on Saturday.