So I purchased a truck that has a 454 in it and shortly after I got it, it through the crank pulley off destroyed it. I chalked it up to the builder didn't tighten it down all the way as their was one bolt completely missing one that looked like it had been loose for a bit by the size of the hole and one that was broken off in the balancer pulley bolts to the balancer. So after much extensive searching I found a new pulley it has the two V grooves and then serpentine in front jot super easy to find put the brand new pulley on and it lasted until last night, when it shot off as well now checking it out this time all three bolts are still tight in to the balancer and each has a solid chunk of the pulley still under them just ripped through the steel pulley. Any one have some ideas as to what could be causing this? I am lost!