Have a 90 civic dx hatch with lsvtec. There seems to be oil leak coming from inside the exhaust manifold. I can see the oil stain by the header bolts on the inside. It seems to be dripping down to the exhaust. What is the problem?

 

maybe there a crack in the head

 

if its commin from inside the manifold it has to b valve seals pull of the manifold and see if the valves are wet