I've tried posting this several times, but it just won't come up... maybe this time.

I'm going to use a 5cyl turbo for a conversion in my Rover. What should I look at buying a used OM617 turbo? What is the best indicator for a good vs. worn-out motor? Compression? What are some desireable compression numbers on the cylinders? I'm looking at one that the seller claims has 450 on all five cylinders... sounds a little high to me. What do you guys think? Help me find a good motor!!!

Thanks for any help!
Ethan