Hello Everyone

I am trying to cast this big block out of aluminum around 90 to 100 pounds worth and i been getting lots of sinking

I made this mold out of steel and it seams to be working well with the exception of the sinking hehe

The first time it sank into the part and made the part unusable, the second try i added 10+ inch to the
pouring basin thinking that it will sink but not as far as in the part, but it sank even deeper, i would say a good 6 to 8 inch

I have a few pictures of my setup i take my time and pour at a good rate and try not to make to much turbulence
I am not sure what i am doing wrong ??
Anyone know ??

Thanks
Biggs