i don't have a v12 but i do have a gt40 but with a 1uz v8. originally i tried a 4.6 mod ford dohc v8. way too big. the 1uz is coupled to a g50 porsche. would love to have a v12. am going to look into the 1gz. otherwise i am going to build a 3uz. install sleeves, FI, flat plane crankshaft, new...