I just found out something- silicone isn't too good to put the block halves together, because gas will eat it. It's better to use anarobic sealer. It works well with aluminum, dosn't react with gas, and it only takes a little to seal ANY leaak in the case. It's not a problem if you don't have any leaks, and I'm not going to rip all my stuff apart to do it, but I'll keep it in mind for the next one.
I'll try to post a part number and description soon.