coolant on top of piston

[sevenmgte]

i didn't know that i had to do the block too, so thats why i did not resueface the block last time. this time will sure do it, but i don't know if the block is still reusable does any one know? cause when i turn the crank shaft bolt to rotate the piston there's water/coolant on the wall of piston hole that sucks. one more thing, i drain oil and it was not mix with coolant.thats good right?