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The rear main seal in the 426 wedge in my 64 Polara has pretty much leaked from day 1. I have replaced the seal several times.... last time I put in the Mancini billet saddle and seal, and a new Milodon pan, but it still leaks. It occurred to me last week that I had installed a high pressure oil pump when I built the motor, which carries 75lbs going down the road. I thought.. That's it! So I went to Jegs and got a high VOLUME pump and installed it. STILL has 75lbs on the road and still leaking. I have no idea where to go from here. Am I overlooking something obvious?



the oil pressure has little to do with it , it's not directly oil by a pressure passage.

What type of crank do you have, stock or an aftermarket replacement .