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I'm sure the bogging down with the nos on is what caused the immediate catastrophic failure but to me it looks like that engine was on the way out before the nos was ever engaged. What I see when i look at those pictures...........
1) combustion chamber and exhaust ports in blown cyllinder have no carbon deposits
2) corrosion on head indicating head gasted has been bad for some time
To me it looks like that cyllinder has had coolant in it for a while. Actually it looks like all of them have but that one was the worst. If i were to guess I'd say that cyllinder got flooded and washed out then blewy.
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