Is there any engine (modern ones) which fits a 4K gearbox without the need of a flunge?

Ferrari v12.

 

:faq:

Edited July 18, 201412 yr by LittleRedSpirit

I don't think so, the K series was discontinued as a unit, neither motor nor gearbox was worth putting onto something else. You'd blow the K gearbox up with much more torque I expect.

 

Start looking for a T-series gearbox and an A series motor if you want to modernise. The T50 gearboxes were behind the Tseries motors and then carried over to the more modern A series engines.