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The sign accompanying the engine. It reads

H-1

The H-1, developed in the 1950s, was the workhorse of the early Apollo-Saturn program. The first stage of the Saturn I and Saturn IB were propelled by eight H-1 engines for a total thrust of 1,640,000 pounds of thrust.

Thrust:	205,000 lb
Propellant:	Liquid Oxygen/RP-1 (kerosene)
Mixture Ratio:	2.23:1
Weight:	2,009 lb

Developed by Rocketdyne Corp.