simple tuning
Another thing to consider is that the heads will have a different combustion chamber volume, so your static compression ratio would be different (most likely several points lower). You'd also need to run the intake and exhaust manifolds from the 5v car.
With the amount of work involved, why not swap a 1.8t (complete) into that car? Its been done before (Oliver Sprenger's RS80 project).
(but still its a very reliable engine after that much kilometrag and years, i did manage to push it to the limit)





