Rocketdynes F-1 engine and it's thrust chamber and nozzle. Five were needed to provide Saturn V's first stage with 7.7 million lbs of thrust. For scale I am 5'10" or 178cm :
Rocket Propulsion Evolution 8.13
Apollo Saturn V Rocketdyne F-1 Engine White Poster – Astrography
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Model, Rocket Engine, Liquid Fuel, F-1 | National Air and Space Museum
A New View of the Rocketdyne F-1 Engine | National Air and Space Museum
Rocketdyne F-1 - Wikipedia
Rocketdyne F–1 – Wikipédia
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Sturn V Rocketdyne F-1 Rocket Engine of the First Stage of the Saturn V Stock Image - Image of engine, program: 226522131
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ArtStation - Rocketdyne F-1 Engine
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Rocketdyne F-1 - Wikipedia
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Rocketdyne F–1 – Wikipédia
Chatsworth CA, USA. 3rd Oct, 2013. A Saturn V F-1 rocket engine is moved from its home of nearly 35 years outside Aerojet Rocketdyne prior to the Canoga Avenue plant's scheduled shut
Apollo Lunar motor - Rocketdyne F-1 rocket engine, 1,746,0… | Flickr
Rocket Propulsion Evolution 8.13
Photos: Recovered NASA engines land at Seattle's Museum of Flight | collectSPACE