The YF-23 prototypes are 67.4 feet in length and have wingspans of 43.6 ft. During the Advanced Tactical Fighter program, one YF-23 was powered by twin Pratt and Whitney YF119 turbofan engines, while the other had two General Electric YF120 turbofan engines installed. The aircraft achieved a speed of around Mach 1.8 throughout the program.

Two Pratt & Whitney F119-PW-100's of approximately 35,000 lbs. thrust each with afterburner or two General Electric F120-GE-100 turbofans.