Read vsi-8 about displacement changes to boosted vehicles. From an already registered point of view I wouldn't stress so much but from wanting to get it rego'd I'd rather have it sorted without any issues arising - an issue like this could cost the RWC, booking fee then the cost of engineering if actually required. A risk I'm hesitant to take.2.2 is an option for a gen 1 (GX) so engineer/vicroads wont care. People over think this, its about the chassis as a whole not just an RS turbo.
I have it on good authority on RSlib forum that this setup works with the original RS heads. Some go another step further and replace pistons with the same as that from the US version of the RS (SS I think it was called - closed deck 2.2 litre, small turbo and no intercooler!)However the compression will be rather high and valves will possibly meet pistons. Rocker arm heads are funny like this.
I wish my budget was up there - and that I could find one but I'm currently working with what I've got rather than spending money where possible. I'd like to have this running next year before another possible house move.Crank and rods could work. 2L cranks are all the same assuming you get a pre 99 one and 2L rods are same same turbo or NA.
If your budget is around 1k someone will have a stock 20G you can jam in and avoid cracking a block open.
Thanks for your input though Barbs. At the end if the day with a second set of HGs I could build the ej20h and a 22 with a little more effort.
Cheers
Bennie