agreeso far I have 108K on mine, and no problems yet..... though I am the 5th owner [hihi] oh yeah, mine's the SPI... I dunno if you could get valve seats pressed in, because (and correct me if i'm wrong) I believe it's all one piece, part of the head....
I wanna know why the Cougar got so many poor reliability marks on it.....that was a Zetec as well..... and if I hadn't been persuaded to not buy one cause of the so-called problems they have, I would've gotten a V6 Cougar [hihi] (I'm still gonna get one, one of these days....I just love them so much [hihi])
That would be the worst mistake you ever made going from spi to ZETEC. The Zetec was not that great you want more performace you better go to a 2.3 duratec. This is my personal knowledge you can make more power out of a duratec then a zetec and personally the duratec is a more solid DOHC engine.my guess here is that zetec outnumbers the spi... more to choose from.. more problems to have. just my two cents.
(but i am curious as i am going to be doing a spi to zetec swap