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For several years I've been trying to solve the mystery of my '64's oil loss; the car has always used around one quart every 500-700 miles. Like many other members who's posts I've read (like Joe Lucia), I suspected the intake manifold gaskets as I've noticed oil on the intake runners every time the intake was removed. I tried several different types of gaskets and sealers. I installed an NOS aluminum intake on newly rebuilt heads and the problem persisted. I tried different torque sequences, I even installed a valley lifter baffle, and different PVC arrangements, all to no avail. After 7 years, two engines and many late nights in the garage, I finally gave up and decided to live with the problem. That is until, I replaced my oil pan and in the process decided to put in a different oil pump. I've always run a Melling 55HV (high volume) and decided to put in a Melling 55 (standard volume) as I read so much about the HV pump being unnecessary and a HP drain. I also wondered if one other problem noted with the HV pump might be related to my oil loss--oil foaming. To my absolute amazement and delight, changing the oil pump stopped all oil loss!!! The car now uses very, very little oil, my plugs stay clean and my car has more HP as the oil is no longer diluting the octane rating of the gas. Case solved.