Just in process of removing head, the gasket as gone and pressurising header tank, when headers came off I can see evidence in #3. But on setting timing marks up when the crank pully is on tdc mark this is where the cans are, can't be correct? Engine is in a car so can't get a clear pic of crank timing mark but it is absolutely on the mark, someone been in before and put it back a tooth out? When I put it back together time it properly to marks? It ran very well prior to head gasket problem?