I have fought with this over and over again. If a valve spring is designed within it's yield stress and below its annealing temperature limits then why relieve the pressure during the storage over the winter or long times that it is not run. I usually have my car out during the winter and go for a ride on dry winter days but this year I probably will not for a couple of months. I have even cranked over the motor at times of long storage, but is it necessary? I had my front coils out a few years back and checked the free travel and they were within limits, the car does not sag and these springs are over 50 years old.

  Vic Correnti