For info - VmcA numbers for 747-200/300 with JT9D-7Q.
These engines are 53,000 lbs thrust.
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From my latest Boeing 747 FOM table.
VmcG sea level STD temperature (lowest V1 FAA tables) = 128 KIAS
Expect lowest V1 to be higher with the 7 kts CAA X-wind factor.
VmcA-2 sea level STD temperature is 159 KIAS.
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I would therefore expect VmcA-2 in a 747-400 to be around 160-162 KIAS
This with engines JT9D-7R4G2 which are approximately 55,000 lbs thrust.
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Happy contrails