Well.....the thing is, at high RPM, they cannot bleed down fast enough, so they cause the valves to float and hang open. That's when bad things happen. Conversely, solid lifters don't have that problem. The lash takes up and room at high RPM that would otherwise cause valve float and prevents it.
You CAN use a traditional anti pump up lifter. Those have a faster bleed rate at high RPM and will not float the valves, however, they require an adjustable valve train with a setting from zero lash, to around .002" lash, like a tight lash solid.
So, since they require an adjustable valve train anyway, the best thing to do is just go straight to a solid and be did wif all dat, yo.
