Solid lifter / Hydrualic Cam

There isn’t really any “problem” running sold lifters on a hyd cam...... but why would you want to?
The sole reason for the hyd lifter is so you don’t need to adjust them.
Set the preload and go.

Part of the parameters that need to be considered when designing a hyd cam lobe is to not create a situation that upsets the hyd mechanism in the lifter.
As such, there is somewhat of a built in limitation to the design.

If you put solid lifters on the hyd cam, it’s no longer maintenance free.
If you’re going to have to adjust it anyway...... why not use a lobe design that didn’t have to take the lifters hyd mechanism into consideration.

If you go back and read the Mopar Muscle article in 05 or 06, “mild mannered mauler”, they ended up putting solid lifters on the hyd cam to solve an upper rpm stability issue.
Look through the dyno results between the two different lifters...... and see if you notice the thing that happened...... that they never mentioned in the article.