This part is from SSTU
cost:
20000
mass:
10.81
category:
Engine
TechRequired:
veryHeavyRocketry
engine_data:
RS-68
{"isp"=>{"vac"=>410.0, "atmo"=>365.0}, "propellant_ratios"=>{"LqdHydrogen"=>15.0, "Oxidizer"=>1.0}, "max_thrust"=>1356.0}