no, stock 600d is 767cc, mine was 903cc with around 60+ bhp and a red line of 8000rpm, the reason I was/am thinking of putting in a different engine is for possible power gains and higher reliable RPM to off set my low gearing, 8000RPM was just 154KPH on my old car, also, supplies of good uncut heads and uncut cranks are kinda low, and I still need to find a crank for a new build if I stick with Fiat power---. the stock gearbox can handle up to 100ish BHP and I have already upgraded the drive shafts so a tuned daihatsu motor of over 70-80bhp and able to hold high RPM is a definite plus. as for purists? lol, I dont care about them, the car is already quite modified from original with changes to brakes and suspension etc............. I was hoping to connect with some DIY or workshop guys over this, as set up in the car will require a bare spare block/crank/flywheel combo in order to design and make a conversion adaptor and check out clutch work, was hoping to find some unservicable stuff to play with. checking out the chop shops half cuts seem cheap enough, but I don't have the knowledge on what to choose as the best basis for a hot screaming turbo twin cam :)