When I did my head gasket (m104), I cranked the Headbolts to 50nm in order and I could not see going any further as when we tried I thought I would snap them off with me and my buddy pulling on the bar (that's what it felt like it would take). But maybe we should have because 1200 miles later, I lost all compression. How do you know if you won't strip or snap these bad boys off when it feels like you can't go any further and thet is with a new head gasget installed?