There are factors on this not mentioned such as ben using 95 fuel, when I told him what fuel to use... I spoke to Daz at endless (who is neutral in this matter) and he said -
"it's not the afr that would have been the issue it would have been the ignition timing, the car is tuned to find max power of the ignition timing and then pulled back a few degrees for safety, but that would have been on the higher octane fuel, could have caused detonation, which can do a few things, melt pistons, melt valves, it can cause extremely high pressures in the cylinders which can I turn melt valves, it can cause extremely high pressures in the cylinders which can In turn cause big end failure"
I did also tell him the front end was a mess and slam panel not welded on, and gave him plenty of chances to do whatever he needed to do to the car inspection wise. Even asking him if there's anything else he wants to go through before selling it to him.