Gday everyone just after some advice on my rn25 hilux been working to put the old girl back on the road and the first thing I've notice it doesn't have the original motor (12r) but has been replaced with 2y other thing I've notice it's a 2y block with 4y head put on just wonder what would be the purpose or what not is there reason why someone have done that if someone could help out that's would be awesome appreciate it