Of Note.. It is actually Rarely that I have encountered a Hydro Unit for a Shovel that is Non-Functional... but, as Tallterry said... Roller failure, ( and Tappet Fit), almost always are the "wear factor".. Oversize units are available, and desireable, If you can find Quality Items.. the rollers on unknown, or Import units are Always suspect. Problem is, Roller replacement, (which to my mind is Most desireable), is most often Not a job for just any old wanna-be Mechanic. It needs to be done properly, precisely, and with utmost care in both components, tooling, and setup. Do Not look for someone who Can do it. Rather, Find someone who Has done it.
Good Luck. And, If anyone locates a Quality Hydro unit for Shovelheads, especially in Oversize. Please Share. Final Note; I for one, have Zero interest in Evo anything, in my Shovelhead, thank you. I already Have an Evo, and do Not desire a Hybrid anything.