Hughes heh237/242 in a 360?

In the current catalog
The Hughes code for SBM solids is STL
Their code for a............... FTH, is SEH
A hydraulic roller .................... is SER
No code for solid rollers

So I got no idea what an HEH is;
other than not nearly as fast clearance ramps, as Hughes makes out their cams to be. Having said that tho, I have had two Hughes cams with no complaints; altho they were pretty tame ones,lol.