I just took a head off a d16a6 which was a replacement motor i never used and i found a small amount of rust on one of pistons then when i removed the oil pan i found some milky oil in the pan so could someone tell me what could have caused this and could it be the block if so how do check for damage also what can i use to clean the oil out of the block and head thank you

 

Takeit to a machine shop...they will let ya know if the block is ok.

 

it could still be good, you probably just blew a gasket. like cimo463 said, take it to a macine shop, if it's warped, they can usually shave it down, it's a lot less expensive than a whole new one thats for sure.