Just recently put head gaskets on my motor. New oil pump also. I ran the pump using a drill and had good pressure. Put in the distributor and started it. No oil pressure at all. I can pull distributor and run oil off shaft with a drill, but none with distributor in. I also pulled oil pump and re-installed. Is there any different length shafts cause I changed the pump?
The end of the distributor shaft may not have dropped down onto the oil pump drive shaft. The pump shaft may have a little wobble. When inserting the dist. make sure it is seated onto the block surface. If it wont drop fully into place a bump of the starter, or manual advance of the crank may help.
Sorry didn't get back sooner. Work and vacation has taken all my time recently. I bought a new shaft, and also bought a shaft for a 390. They are both the same size, but the 390 shaft is 1/4 in longer. When I originally pulled the distributor, it had no seal and was pucking oil on top of the engine. The gasket set came with a big rubber tapered seal I installed in the hole. I think it raised the distributor enough to lose contact. With the filter off I could crank the motor one time and pump oil. Next turn of the crank and nothing. Towards which end does the retaining washer go?