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Fourteen firings of the Rocketdyne J-2 rocket engine performed in Test Cell J-4 of the Large Rocket Facility, using modified augmented spark igniter propellant supply lines, are reported herein. These firings were accomplished during test periods J4-1801-39 through J4-1801-41 at pressure altitudes ranging from 88,000 to 109,000 ft at engine start. These were the initial firings at simulated altitude conditions, all related to Saturn V/S-IVB conditions, incorporating engine modifications that were performed as a result of malfunctions that occurred during the flight of vehicle AS-502 on April 4, 1968. Engine start transient evaluations, augmented spark igniter propellant line strain data, engine steady-state and transitory vibration data, and calculated engine steady-state performance data are included. Satisfactory engine operation and augmented spark igniter operation were obtained. The accumulated firing duration was 181.7 sec.