Hey Matt,
Thank you for your inquiry.
"Hi I'm thinking of doing a l67 conversion in my vy ute. Besides the engine, loom and ecu what else has to be changed?"
Assuming you get an L67 engine from a VT-VY, then it will bolt straight up, however you’ll need to make sure that you use the original flex plate that came with the L67 engine, given that they’re an externally balanced engine.
You will also need to run the factory L67 intake duct
Ideally you would also want to run twin cats, like the factory L67 engine. In saying this though, if you have a late series 2 Calais, you may already have these fitted
Please note that you can still run your current wiring loom and computer, however your loom will need to be slightly modified and you’ll need either a custom tune or mail order tune to suit. The later, we can supply depending on your mods
If you have any more questions please don’t hesitate to ask
Kindest Regards,
Steve