I bought a SDL with 166,000 miles and a -14 head. After 4000 miles it started to eat coolant and exhaust white smoke. It never overheated while I owned it. I decided to spend the $3000+ to replace the head with a new one (-22). When I pulled the old head it had cracks on three cylinders, between the valves and between the valves and the prechambers. I suspect the previous owner overheated it at some time, even though I was told it was never overheated. In hindsight, I should of suspected something because the radiator, water pump, and thermostat were all replaced prior to the sale.

It runs well now, but I have invested considerable more money in it than I had originally planned. I wish I had been more familiar with this forum before I bought the car. I probably paid $3000 too much. However, I now have a great running SDL and am looking forward to many years of service.