yep,, i have over a period of time broken 3 cranks, all in the same spot on the crank, even after a lot of meticulouse prep work, and its not due to just 1 thing , its a factor of many , touque is the main one , which is what we all want , the more you have the higher the chance is of something breaking , dont expect a motor that is highly stressed to last for ever it wont , but you can prolong engine component longevity , cryogenics is now widely used in high output racing engines these days, maybe someone else can explain this type of treatment and process .