Thanks for your reply!
I agree, it has to be going somewhere.
I personally put the heads on the block both times. Following the factory service manual and ensuring everything was correctly prepped and cleaned prior to installing the cylinder heads.
I do not believe coolant runs through the intake in anyway on they engine, it used to run through the throttle body but I have bypassed it.
It’s just a shame that I have gone through all this work to ultimately do the job a third time, but I am still not 100% sure on how the combustion is getting into the cooling system with everything that has been done so far.
Something isn’t adding up.