Chris,
Dan Jones will be the man with the straight dope regarding the beehive springs, he has them installed on his new motor, in conjunction with a hydraulic roller cam.
GM has installed them in the new Z06 'Vette, also with a hydraulic roller cam. The idea is to accomplish resistace to valve float with the mechanical dampening properties of the beehive spring, instead of resorting to excessive spring pressures which would lead to accelerated valve train wear.
Your friend on the DTBB, George
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