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Message: <blockquote data-quote="fabianyee" data-source="post: 178277" data-attributes="member: 6">M50 could be derived from M20 but that doesn't mean it'll be technically viable or easy feat. FYI, even the engine block for the J-Tronic differs from the Motronic engine block. M20 uses timing belt but M50 uses chain, that in itself is a big technical challenge in the conversion. The word derive can sometimes means it is based on certain block but with 300 minor changes in total. So the question is would it be technically and economically viable to do all those changes on your own. There was a tuner in the US which did a prototype 24 valve head for the M20 but abandon the project after the introduction of the M50 24v engine. I read that article on the net but not sure can still retrieve the page anymore.</blockquote>