Cloning a hard drive on a Mac is a different process. If you have a newer MacBook or iMac, you can't swap out the hard disk ...
TLDR; yes, it is possible to add an SSD to a 2011 27" iMac without going through too much hoopla. Between everyone having issues finding parts, non-workable guides (due to parts), and general ...
Thanks for the writeup! Just about to do this to my 2011 27"er. Prolly gonna get a Intel 520 128gb or a Samsung 840pro Can't wait. I just want to finish a project I'm working on before the brain ...