One thing I've noted is that both the OP and a later post get the status of the F-1 incorrect (the OP more than the other post). When the F-1 production line was shut down, thousands of hours of interviews with people who designed it and built it were taken and recorded. These interviews included what problems they encountered, how they solved those problems, and hundreds of other details about the production line that were not a part ofo the original plans for the engine or the production line. The existance of this documentation is the only reason why restarting F-1 engine production is even on the table for the boosters for SLS - and why, even in early 1990s, it would have been lower cost than developing a single-use example of the SSME and putting that into production. To go further, most ofthe work currently being done on F-1 engines involves testing out replacement materials for parts that we are not allowed to make anymore because of environmental concerns (such as too much Chromium in the alloy). They have pulled an old engine out of storage for some of tests - but it is my understanding that those tests are at least partilly to validate the modes they have been using for subassemblies of the engine. Also, for the record, the engine they have used for testing so far was not on display, but was in storage.