"It was originally a 2.5, but we reduced it to 2.0-liters to fit with the regulations," says Wilcock. "We used a standard casting, but the cylinder head was completely revised. Forty individual parts were welded to the head and the process was so complex that just one in three of the heads we produced was of sufficient quality to be used on the car. The rest were just thrown away. At the time, a Touring Car cylinder head was more expensive than those used in Formula One."