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Hey gang, Curious what people think these marks may be? There was nothing loose in the cylinder once the head was pulled. I'm thinking either: -detonation -contamination (big chunk of carbon) -engine damage (piece of piston ring that has exited exhuast?)

Hi guys i own a auto s pack vs v6, I just bought a vt gearbox from series 3 vt install was fine worked for weeks perfect, I was driving kids to school in 40 zone i applies small amount of accelaration an i hear a clink from underneath car , then the entire gearbox stopped working . nothing no...