its an odd one.
how do you know its got the 190 motor? you can replace engine covers.
Supposedly the 190 engine has a black inlet manifold whereas the 175's have a silver inlet straight up the guts of it at the top, that's be a starting point and if we have a silver one I'd be sussing it out.
Anyway I had a whole thing typed out but scratched it in favour of the VIN system ... To the OP, just grab the VIN off the VIN plate lower left of the windscreen and compare it to the decode below to see what engine we're looking at to begin with ... If its a genuine SV6 it will start with 6G1ZK52
70XXXXXXXX
Example Number 6G1ZK52F05L123456
First 3 - World Manufacturer ID (6=Oceania G=Australia 1=Holden)
Fourth - Model Series (Z = VZ)
Fifth - Luxury Level (K = Executive,SV6,SS. L = Berlina. X = Calais)
Sixth - Body Style Code (5 = 4 door sedan, 8 = Wagon)
Seventh - Restraint Code (1=Active Seatbelts,2=Active Seatbelts with driver and pass airbags,3=Active Seatbelts with driver airbag,4=Active Seatbelts with driver, pass and side airbags)
Eighth - Engine Code (B = Alloytec 175, F = GEN III V8, 7 = Alloytec 190)
Ninth - Security Check Code
Tenth - Model Year Code (5 = 2005, 6 = 2006 etc.)
Eleventh - Plant Build Code (L = Elizabeth)
Last 6 - Sequential Production Number
OR if your lazy these boys have done the work for you, just type it into
VZ Commodore VIN Decoder
Its pointless running in circles trying to fix something that might not actually ever have been fitted to the car to begin with. The paddles and "V6 Alloytec 190" engine covers are easy to fit, as are external body parts. Like the Icemans story I once had a VX Executive that was kitted up with a complete SS interior and exterior, and apart from what was under the bonnet it was hard to pick. When I traded it in the dealer valued it (and bought it) thinking it was an SS. I took the keys to my new VZ and they started up what looked like a VX SS but sounded alot like a V6 Ecotec