I've heard of cracking before but this is way beyond that! 80k miles on it. I've seen other inlet flange pics with 100k miles that looked a hell of a lot better than this. Anyone have an explanation why mine got this bad? Running too lean maybe? Too hot? I did over heat the motor a few times and eventually blew a seal. I discovered this when I tore the motor down. Could overheating have caused this or is this long term degradation?

Thanks!

 

Not too different from mine. 104K miles by the previous owner.