When looking in my expansion tank there is brown sludge on the surface of the water but there is no mayo under the oil cap. When the car idles it is blowing out lots of white smoke but when revved or under load there is no smoke. Not loosing any coolant from anywhere either. Also when the car idles after a decent run again there is no smoke, only smokes when its not been run for a couple of hours. Headgasket or porous head or both?
The engine is standard so if replacing the head gasket is the best option just a standard genuine GM LET gasket?
In an old thread I put up asking about this I was told the valves were definately the same. Ordering head set from Vaux tonight and got new head bolts and washers already so looking good for sometime this weekend if thats ok with you Ste?