While I appreciate that people have had issues with high EGT in the past, especially in the early versions of the ZD30, I admit I'd be seriously reluctant to apply heavy handed fixes that we all agree are illegal too.
Are there any statistics available that show the percentage of these engines (year by year if possible) that actually have failed because of excessive EGT?
Even better, with the cars that blew engines, what was the configuration? (did they have bullbars without adequate openings at the front, high mount winches or other mods that might have contributed to overheating)

I guess being an engineer, I have limited imagination but like to go on numbers (facts and figures)

A blown engine is no joking matter but neither is voided warranty on a new engine or a defect notice from the boys in blue