Hard block recommendations

When using whatever fill you wish, make sure you have a small semi-flexible rod to massage the air bubbles out as you fill it. Also, my suggestion is to wait at least a minimum of 4 days before turning the block t do the other side. When I did mine, I used torque plates, I had one and borrowed another. Once I was through, I kept he block on the stand and rolled it in and out of the shop the let mother nature help with the curing process. It takes at least two weeks total for the stuff to completely cure. After the two weeks, I hauled it to my machinist and let him do his voodoo. Sane