White smoke would go (initially) as soon as it warmed up but mine deteriorated so fast I stopped using it so there wouldnt be any further damage, interestingly the guy who rebuilt it said that in his opinion (20 years land rover tech) the p38 v8s dont suffer head gasket failure in the true sense, but they suffer with a lack of seal around the top of the liner, which is why so many have multiple failures.
Steve