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Hello Gavin The simplest is a "lower radiator hose heater". One supplier here lists several - a 375 watt unit for 1 1/4" hoses, and 600 watt units for 1 1/2, 1 3/4 and 2" hoses. All 120 volt, unfortunately - but similar units should be available in 240 v from dealers or jobbers on your side of the pond. Prices about $45 Cdn - 20 - 25 pounds sterling. They are about 3" long, round, about 2 to 3" dia, with stub pipes out each side to fit into the lower rad hose, secured with hose clamps. Power cord attached with a plug-in for easy removal if desired. I think the 23C is 1 1/4". A regular block heater can be inserted in a frost plug hole, but some of the holes don't have enough clearance inside, and you don't know until you remove the plugs. This is best done when you have the engine on the bench for overhaul. The heater in the lower hose is a bit less efficient than the regular block heater (more heat loss to the air), but works great. Don't know how you would get the cup heater to heat the water around the cylinders - where the boost is needed to help it start more easily. There are magnetic heaters to attach to the outside of the block or under the oil pan, but I feel these are less effective and less efficient than either the rad hose or frost plug units. Hope this helps.
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