Hi Ken,
my poorly casted AMC air head makes 150 C easily - the genuine VW 120
typically. Know how to convert to F ? Times 9 divide by 5 + 32. I don't
monitor the water head temps separately because - as long as there's enough
coolant in the engine (which is checked by the coolant level sender in the
expansion tank) - both heads will have the temp given by the standard gauge.
I'd say 110 C max.
Have fun,
Michael, Germany
80 Westy
86 GL