I think you'd be better served by using a larger radiator than by trying to use the additonal spigots on the turbo pump in conjunction with a heater core to provide supplementary cooling. This being so, a first step would be to remove the shutoff valve Note that the heater core would not be of any use as a supplementary radiator unless air were flowing through it, which in turn would mean that the cockpit would end up very hot in summer. It's my understanding that moving the heater takeoff spigot from the middle to the rear of the head will increase the coolant flow through the rear of the engine, provided the heater shutoff valve, if present, is open - but has no effect if this valve is closed. If everything else was fine, the turbo pump would provide a little extra cooling for a safety margin on hot days. This provides another return flow path back to the water pump in addition to the one through the intake manifold water passage and cools the head better. A 3/4 inch 90 degree molded hose then connects it to a second water inlet to the turbo pump. In the turbo engines and later 912's that use the uprated turbo water pump, the frost plug is replaced with a pressed in nipple. Quoting Tim Engel from something he wrote years ago:
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