My uncle lost TWO this season in his stock car...the first one had been ran for two years and then a big chunk broke out of the main webbing...don't know what started the destruction but when it was done the crank was broken and a part of the main cap and block were in separated from the block still with the bolt in it. It was an aftermarket crank in a 2 bolt GM block. He bought another block, had it bored .040(wouldn't clean up at .030) new rotating assembly...first night something happened..not sure what caused it but when it was over the block was split down the cylinder...And this man does know what he is doing as far as assembly goes....the class they run in doesn't allow aftermarket blocks. This is a claimer class but this engine was high compression running methanol. Dirt stock car.