A factory Opel 2.4 also has different rods, so you'd need those too. They have a different pin diameter, are full-floating, and are longer than the 1.9's. So figure in a set of rods, plus some extra grinding in the 1.9 block to clear the 2.4 crank's counterweights. Oh, and the 2.4 rod bearings are different too, and MUCH more expensive. Probably another $500 Euros for the rods and bearings.calvin said:The other way to do this is get a 2.4 crank from Germany and the right size pistons from say Reise motor sport in Germany. That will set you back about $1900 Euros plus shipping but they just slap in no fuss no muss 1200 for the crank 700 for the pistons. Minor point the stock 2.4 crank weighs lots more than even a built up and reground 1.9. A lightened one will cost you say another 600.