[Robert DeLong]

From my understanding, the issue was the aluminum head would cause the head bolts to loosen. I believe the fix were longer head bolts that would go deeper into the engine block.

From what I saw listed on a search, were of the Northstar 4.6 liter engine, but my personal understanding was that all Northstar engines actually had that issue. But the 4.6 liter was even more prone to fail much sooner.

If I were you I would contact Cadillac directly. Then you are more likely to get the most accurate history. Good luck with your beauty. Just out of curiosity, what color did you get, exterior & interior? 😁

[norwaypinesavage]

My exterior color is silver, the interior is the same color as in your picture. I’m 1500 miles away from it for the winter, so I can’t send a picture.

I did look up info about the head stud problem. I hope Cadillac (it would now be GM Powertrain) has some kind of coating for the studs by now to prevent recurrence of the corrosion. If not, there is an aftermarket fix that uses studs with larger diameter in the block and a standard diameter for the head. These are much more complicated to install since they involve precisely drilling and then re-tapping deeper threads in the block.