This part is from SSTU
cost:
2000
mass:
1.6384
category:
Engine
TechRequired:
heavyRocketry
engine_data:
H-1
{"isp"=>{"vac"=>290.0, "atmo"=>255.0}, "propellant_ratios"=>{"LiquidFuel"=>0.9, "Oxidizer"=>1.1}, "max_thrust"=>388.0}