Originally Posted by Henn28

Ha, sorry if I wasn’t optimistic and bright enough for you. It’s a great motor compared to the 4.4…which is also a fun V8, but since I have been down this path already I can tell you they are hard to track down. I came across two in six months of looking before I bought a new one from BMW. One had new guides done and the other was a lump on a pallet, sitting outside it looked like. Neither had a fresh pressure/leak down test nor would the sellers do one for me.

The blocks are super durable, but if the bores are damaged then your options become very limited.. Not many shops will hone Alusil and liners get really expensive. The 4.6s had an issue with bore scoring in specific cylinder(s) and they really don’t like overheating for more than a few minutes if not caught. I got scared that I’d find problems after paying too much for a motor and then find block problems, and still have a motor that needed thousands in other work (chain guides, etc.).

At any rate, I’m sure you can find one eventually, but I’d insist on a pressure and leak down test. There is a great thread on Bimmerforums.com from a guy who bought two complete M62tub46 motors but both had bore problems due to (his opinion) an oil problem in one of the cylinders coupled with too much heat, or more like not enough cooling. He ended up having liners put in with custom forged pistons and rods. Fantastic project, if you’ve got the time and money.

****edit****
Found the thread, it’s a good read about one guys m62 (4.6) motor adventures.

https://www.bimmerforums.com/forum/s...6#post30867616