Originally Posted by Roelof
Just modify your current crank by yourself.
The 321t has a tungsten weights in the crank, the 421 doesn't. From what i'm told the timing in the 321 crank isn't too much for the offroad 421 engine. Unfortunately both engines are discontinued. A modified 421 is supposed to be a great engine. It's for a friend and i'm not a nova guy, but it's my engine modders favorite nova offroad engine.