Ok, bear with me while I ask this question.
There are 2 types of 2.0 16v engine, the SFI and the Ecotec.
But, I have found out that some of these engines were hybrids of the 2. This must have happened at change over time.
My mate has a Cav SRI which has a 20XE (SFI) head on it, but with the newer DIS ignition system. He also found out that it has the Ecotec bottom end, as it had the G50 idler wheel problem.
So, my question is thus: can I just chuck a SFI head onto my Ecotec engine and if not, why not??