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The original question was how close to coil bind do we go. My best information to date is .040" because the spring actually opens a little past the lift of the cam (inertia) and at this clearance, stops the harmonics that would otherwise take place. 330 on the seat is the max load acceptable for stock diameter lifters. Any more and they tend to spread at the bottom, making them very difficult to get out of the bore. In NHRA Comp racing they are running the same spring pressures BB or SB: as much as they can get :) Generally 450 to 500 lbs on the seat.
 
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