Hi, no I had my engine conversion done by Ital Auto's in Derbyshire. The rear head had gone on my old 2.5 unit and two piston rings, hence why I just went for a reconditioned engine.
In terms of performance compared to a healthy 2.5 engine, it wouldn't be fair for me to say as the 2.5 unit in mine was well on its way out! Obviously the 3.0 unit is more powerful, not a great deal, although yes I did notice a significant difference, more so in the torque!
From what I can remember, there was something different with the oil cooler on the 3.0 unit compared to the 2.5, but others may be able to confirm this????
Alfa Romeo 156 3.0 V6 24v Lusso (2000)
Lancia Delta HF Turbo IE (1991) - Rust In Peace !