[blykins]

There are "universal" lobes. Some lobes will tolerate hydraulic lifters or solid lifters. With the lobes that are as such, the lash spec will be very low with solid lifters, such as .005-.010".

In getting back to running solid lifters on hydraulic cams, I've seen guys try that because the hydraulic cam wouldn't rev. Generally, that's not a lifter issue, it's because the cam wasn't spec'd correctly, valvetrain isn't light enough, or things are just not right in general. Putting a solid lifter on a hydraulic lobe in that situation is a band-aid only.

Keep in mind that there are also "aggressive" hydraulic lobes and aggressive solid lobes. The key is choosing the correct one for the application. You don't want hydraulic lobes so aggressive that the lifters can't keep up and you don't want solid lobes so aggressive that they eat valve springs.