Hello Larry : I designed a block heater for the 162F many years ago and used these on several RotorWays . I just happen to have a customer engine on my bench yesterday that has one of my block heaters.
Also a glue on oil pan heater works very well on the bottom of the oil tank.
I took a couple of photo's of the installed block heater and can send it to you if you send me an email at
al.behuncik@gmail.com