4”x12”x12”
approx equals 10cm x 30cm x 30cm.
one liter is 10cm cubed ... so you are talking about 9 liters volume
One liter of water is one kilogram
Density of lead is around 11.5 ...
so your lead block was a bit more than 100kg ~= 220pounds
Yeah, I forgot to convert to kg! It was probably is bit smaller dimensions than that, since I could barely lift it alone. Likely no more than 150 lbs. The bolts made nice legs.
But it was a heavy momma for its size! And to find we could have removed it early on in the move...