[whtteg]

It could be a number of things, the most likely is the camshaft seals. There is a seal/plug next to the distributor that will start to leak at around 30K miles. also the front cam seals could be leaking and the oil is running down the front ( the side facing the driver's fender) and running along the seam of the head and block. You can't see the cam seasl on the front though unless you remove the timming belst cover etc.