I was given a 1986 Saab 900i auto, and ascertained it wanted its headgasket attended too. I got a new gasket and fitted it according to the book and also checked the flatness. This was very good as all I could find was 0.001. Put it all back together, timed it, fitted new chain. Last but not least ran it and it runs very nicely apart from the tailpipe issuing a cload of white smoke. This I know is moisture and am wondering how long it should be issueing?