As part of the SLS archeology project, a group  of NASA engineers have refurbished a gas-generator , essentially a separate rocket engine used to drive pumps for the main engine, used for the famous Saturn F-1 engines and fired it several times.

• That sound in Huntsville today? It was NASA test-firing a piece of rocket history (video) – Huntsville Times
• Saturn V “moon rocket” engine firing again after 40 years, sort of: NASA pulls giant engine parts from museums, remakes ’em, and lights ’em up – Ars Technica
• World’s Most Powerful Engine Blazes Path for Space Launch System Advanced Propulsion – NASA
• NASA Engineers Resurrect And Test Mighty F-1 Engine Gas Generator: Testing Will Aid NASA’s Space Launch System Advanced Development – NASA – Jan.15.13

Engineers in the F-1 gas generator project take on the 1960s NASA look.