Stronger keys are possible, and in some applications the key is to shear to save the machine. In our cars the key appears to me to be an alignment and securing mechanism intended to hold the pulley from slipping.. Remember that mine did its thing only when the motor went into a violent shut down as a result of high IAT onset.

THis is the reason that I did all the changes and upgrades to the cooling systems, ie the super cooler and stat redesign cause Iam driving mine hard doing autocross at full power for most of a minute-----less if I learn how to follow the course better..

I dont have any heat related issues now even in the summer races or at summit point doing 20 minute course runs. Enjoy, Woody