Some of you may remember that I bought a hot Rebello motor for my early 260z and when I first started it there was a clunking sound.  Luckily that problem ended up being a clutch slave cylinder bolt that was too long and it was resolved pretty easily.  Since then I put about 200 miles on the new motor and its been reliable.  Yesterday I went to my garage to start the car for work and after running for about a minute there was a horrific clunking sound so I shut it down immediately and too