English: BE-4 methalox rocket engine, closeup of powerhead. From the engine that was originally serial number 101, manufactured in Kent, Washington during October 2017. It was the first BE-4 engine to be hotfire tested, on 18 Oct 2017. It was subsequently hotfire tested, disassembled, rebuilt and retested several times to its current iteration in this photo, noted on an adjacent placque as SN 103.
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