Originally Posted by
Ian S
The photo of the gasket looks like it was badly det'ing, plain and simple, you didn't lift off and that is the result.
I have a gasket here that looks the same, including the eroded path through to the water way. The chap said he had turned the boost right up, he had no gauge so didn't know what to, very loud music playing and was on full throttle for while then car started to smoke from the exhaust (would have been steam) and judder and then stopped.
He couldn't hear the det'ing over the loud music. He wouldn't have know what it was even if he had.