The pic isn't that enlightening, but the whole article is very interesting. Such as this quote.
"This wouldn't be your daddy's F-1," Coates said. "We'd use new materials and try to simplify it, update it."
This wasn't a full up F-1 Rocket Engine test, but the smaller engine which helped to power the pump that ran the F1. Considering that the F1 developed about 1.5 million pounds of thrust and the Saturn V had 5 of them in the first stage, I don't think the neighbors in Huntsville would like a full up test.
Some more info about the F1 Engine is available at the following links.
F-1 Engine Fact Sheet - PDF File
|F-1 Engine Diagram - Wikimedia Commons|
Apollo 11 Moon Rocket's F-1 Engines - SPACE.com
|Saturn V's F-1 Engines being installed - Wikimedia Commons - 5.15 MB photo|