The museum displays a J58 jet engine in their Century of Flight hangar; the
engine is presumably one removed from their SR-71 Blackbird.
The J58 engine was also used by the A-12 and YF-12A.
For additional information on the J58, also known as the JT11D-20, see the "Engine &
Afterburner" section of the SR-71 Flight
Manual. In particular, there's an engine manual on page