InRacing in Nottingham seem to be energetically using new technology to simplify the manufacture of replacement parts in all kinds of impressive ways, so they might well be using 3D printing to make patterns. They do make new 2-litre heads and blocks already. The fitter who showed me all all this didn't know how much a new block would cost. It might be a matter of 'if you have to ask the price, you can't afford it'.
Hugh
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