hi mate sorry to bother you just wanted to pick your brain about the st 170 turbo engine you are running . I know you have to use a 1.8 mm head gasket but is that 1.8 mm compressed thickness ? or 1.8 mm before its fitted ? and I know u use the 170 valve springs on the black top head but I saw on one of your post that you mentioned 3mm shims ? could you shed some light on that subject

thanks in advance .... excellent threads by the way