Yes, and conical. Each coil has a different natural frequency so the coils do not excite eachother.
For my 1966 Ford 289 heads the installed height is 1.65". Beehives all seen to be 1.8". Just a couple of years with the short installed height. The HiPo 289 had 1.78" installed and newer SBF heads are that also, so the Beehives could be used on them. Would have liked to use them.
