In the automotive industry, the drive towards reduced fuel consumption and emissions is leading to research on the effects of lower coolant flowrates and volumes in internal combustion (IC) engines. These reduced flowrates are increasing the likelihood of boiling in engines. Boiling causes the generation of vapour, which, if not controlled, could lead to overheating with catastrophic effects. For such a situation to arise, a level of heat flux known as the Critical Heat Flux (CHF) must have been exceeded. However, the presence of 'controlled' boiling can have a number of advantages with regard to the quantity of heat to be removed. Consequently, any boiling-based cooling strategy requires a detailed knowledge of the CHF. In this work, the CHIF in a simulated IC engine-cooling gallery is obtained experimentally and a benchmarking study is used to determine the most suitable modelling approach to undertake for predictive purposes.