Even though I havent even put 7,000 miles on my first motor install I purchased a cheap S14 2.3- liter motor from the first M3. In combination with my other parts lying around, I am going to build a 2-liter M3 motor with the bottom end (M10) from the 2002. Actually, the blocks are identical except for displacement but machining will probably be required to get all the oil and coolant passages to line up. The M10 block has been in production for over 20 years. My friend and mechanic JP Cadoux will be teaching me how to hand build my first motor and I will be teaching him to control fuel and spark delivery with MegaSquirt open-source software.
I dont want to reveal too many details yet because I am not sure what is possible but I have some very exciting ideas. This motor will be completely custom from the machine work to get everything to mate up to the pistons and rods. For what I am trying to build I dont think I’m going to find anything off the shelf. I am going to attempt to use the same camshafts and valve train as well as the M10 2.0 crank of course. Once the machinist has his hands on it I will know more.