I have a 93 Z28, I need some help. It is smoking on the passenger side exaust manifold. I have replaced the rear main seal, the front crank seal, the oil pan gasket, and the valve cover gaskets. I know the car doesent have a blown head gasket. Where could the oil possibly be leaking from? Smoke is coming from underneath the passenger side exhaust manifold and exhaust pipeing under the car. There is oil residue on the manifold heat sheild. Does any one know where this oil leak could be comming from?

 

how long has it been smoking? maybe you spilled oil somehow when the valve covers were off. maybe they are leaking now.