I've just done the headgasket on my 2wd saph, when i cleaned the block face up i noticed a very faint line from a bolt hole out to the water jackets. The car was running fine before i took it off, its not been studed, and the new bolts have all torqued up ok! Hopefully have it running sunday, but am i wasting my time finishing it off? Its been in garage for 18 mounths having underbody resto and cant face having to break it