I've been tinkering about with a saab head. In the process of grinding out the ports I keep stumbling across small fine cracks around 1cm long by 1-2mm deep. Sorry I can take a picture it just doesn't seem to show them. They seem to be under the surface of the casting. I know they are cracks by the way the bits come off when grinding. I can grind them away mostly but should I be worried by these? Never come across this sort of thing before! notsure.gif