Originally Posted by MouseFink
Beehive valve springs or dual standard valve springs will not fit a Vortec heads without machine work. The Vortec valve springs are 1.241" OD and the Vortec heads have spring pockets that are 1.248" OD with a inside spring locator boss that is .750" OD - .775" OD. Beehive valve springs are 1.310"" OD x .885" and require a pocket that is machined to 1.350" OD x .775" ID with the seat cutters that are available. Dual valve springs are at least 1.300" OD in order to accommodate the inner spring.
Most beehive valve spring failures can be traced back to the bottom coil because they were fitted on Vortec heads with re-sizing the spring pockets.
There are MANY different beehive springs out there, some will fit, some are too large in diameter for stock seats, and some require a different installed height. Like any other spring you need to check the info for each different part number.