Getting back to the original question which was how far off the bottom of the pan could the oil pump pickup be placed. The problem might be looked at like computing the area of an air filter, and using this to figure out the capacity under the pickup when 1/4" off the floor. Thinking of this area like the circumference of a cylinder that is the diameter of the pickup and the height being the distance off the floor. We can use Tom's 3.6" screen diameter and this produces a circumference of about 11". Take the 1/4" height from floor to pickup and that gives 2.75 square inches of effective area the oil has available to pass through. This is only about half the capacity of the screen area but many times over the flow rate of the pickup tube area which will be the choke point.
So thinking 1/4" would be totally safe? Distance could be less according to the math, but no reason to push the clearance any tighter.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 Catalina Safari Wagon.
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