When i had the cht probe under the plugs , the temps had a spread 110/ 140 c i did the same mod on the LCH as jabiru has done to their heads .
So now , as with the aircooled heads temps eaven out to those lower numbers .
I'm Guessing that the probes now in the cooling air flow on the outside face of the heads
I moved the coolant temp probe from opposite to the exaust side , which used to read a hot spot of ; up to 128 c , in climb , to the opposite head , hence reading the flow in the waterjaket (?), opposite the intake , 102 c in climb ,and at altitude coolant temp is a lot closer to cht 's
I've never seen any signs of it booling .
I guess it will take time to present these numbers in a way that covers all the bases , as a operating manual , ect
But as ive mentioned here , these posts are only my musings ,
Mike