[blykins]

Nothing wrong with running those lifters with those spring pressures. To add to that, 120/290 is WAY LIGHT for a hydraulic roller and you will end up floating the valves.

Those heads are not 8000 rpm heads....145/380 are very typical hydraulic roller spring pressures and that's pretty much my go-to pressures for any hydraulic roller lifter.....OEM or linkbar. I've used the OEM lifters up to .640" lift with similar pressures.

I've never seen a lifter spider hold-down broken before....my guess is that the lifter was coming up too high and was binding on the hold-down.

This combination should have worked, no problems whatsoever. I'd be looking for a smoking gun.