[Bleach]

OK, according to Y-blocksforever, “The Y-block steady rest, used on 1954-1956 Ford engines, was designed to enhance engine stability and reduce cabin vibrations by supporting the front of the engine, often dubbed a "freeway hop" dampener. It linked the engine to the frame crossmember to reduce resonant vibrations on older chassis, though it was discontinued for 1957 when frames were strengthened.”