So, I have to know........ (solid vs hyd)

Every mfgr switched to hydrolic lifters so there must ahve been a good reason for it.
I haven't done the reseach so I dont know what the reasons were. I dont believe the noise and/or need of periodic adjustment was the main reason though.
Relieving some of the residual pressure on valve springs, stems, and spring retainers, in a standing engine may be part of several reasons combined.
I do look forward to out with solid and in with hydrolic in my street only 273 build. The noise/adjustment issue being my reason regardless what more I might learn through research.