My doomed 408 build

Soft lifter?

I suspect debris in the lifter is the culprit.
If you could get it out without pulling the heads, it wouldn’t be that big of a deal.
But alas, I don’t think you can.

Also, with many hyd roller lifters you can’t get the internals out of the body without grinding the link bar retaining rivet off....... so they’d need to be replaced.

Regardless of what else I did, I’d pull it apart to see if that’s why it was soft.

If there’s debris in it...... that’s not a defective part type of problem.

FWIW, the spring listed for use with the new hyd roller cam has a noticeably higher rate than the Ede springs(as you’d expect with the heavier lifters).
344lbs/in for the Ede, 402lbs/in for the Comp.