Dumb question. Who are you asking, OS Max, Enya, Nelson and Mecoa? This is hard fought proprietary information you're asking for free. If you can't buy the engine you want then reverse engineer it, then you're not up to the task besides, there's more to it than that. Does you're friend do aluminum casting, can he get the exotic metals for the piston, does he do chrome plating and have the equipment and skill to hone round within 50 millionths, what about color anodizing and laying up CF pipes? Did you think that with CNC machines the computer does all the work LOL! Is he ready to produce a small number of engines on a thin profit margin in an environment that's going electric? It's a business model that won't work anyway, even Fox gave up and they had a wide product line. Get over it Traxler you ain't got the juice.
MM