What I have seen is after head milled ,block milled, is the head bolts either stock or even aftermarket tend to be to long, , then add in debris in the bolt hole and you have the makings of cracking the block thru the bolt hole.
It maybe a small crack now, But it will grow!
Temp fix,, is stud it and seal the stud,

Last edited by dennismopar73; 03/23/13 09:17 AM.