Beehive means the top of the spring is much smaller in O.D. than the base. This allows for a smaller O.D. retainer, resulting in a significant weight savings. Weight is an important factor in the valve train. Lot's of people make the mistake of going to a double spring to increase pressure, without considering the fact that they just doubled the weight of the spring assembly. The extra pressure is negated due to the overall weight of the spring package.
Steel retainers, designed for our Beehive spring packages weigh 10.4 grams. Factory LLY-LBZ-LMM-LML retainers weigh 21.1 grams and the LB7 retainers are even heavier!
For additional weight savings, SoCal Diesel has an optional Titanium retainer that weighs 5.7 grams.
Hardened O.D. spring cups keep the spring centered in the spring pocket and protect the aluminum cylinder head from wear.