The V12 isn't 2 m20's, it's V12 motor that is run like two 6 cyl with 4 ECUS, 1 for each 6 cycliners, 1 to control the two then a final one to basicly oversee them. Drive by wire control works the throtle. (No cables) The heads are totaly different from the M20, slender, they are run by timing chain. The heads interchange from left to right by swapping a plate. The Aluminum alloy in this engine has silicon mixed in and after machining the bores the aluminum is etched out to leave a crystallized silicon surface, the piston rings run on the aluminum cylinder bores (no sleeves). I have worked on a few V12's and I'm (in the not to distant future) putting one into an e30 bmw, I have done my homework. If you want to know anything else about the V12 just ask.
Last edited by Starmavin; 02-19-2006 at 11:09 PM.