There was a guy advertising on Los Angeles Craigslist a few months back, He was swapping Diesel engines into the SL and SEL body style. I emailed him about getting a 450sl and he said something like 10K, if he obtained the car. He was in the process of doing an SEL but i never heard back from him, not that I would spend that kind of money on that car...

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1984 300D Water-Alcohol Injection System, Pyrometer & Boost Gauge running B100 (soon to be homebrewed!!!)