[eightsandaces]

At the time of introduction, the 2.5 / 4 was the largest displacement 4 cyl engine in a production car. The motor used belt driven counter balance shafts and was a valve interference engine as well. Many mistakenly say it's half of a 928 V8, the reason they get that impression is the commonality of some parts and design. It took a while to wind up but that car was incredible, it handled impeccably.