It was necessary to modify the under-bonnet space to squeeze the V8 engine into the P6 engine bay: the front suspension cross-member had to be relocated forward, while a more visible change was an extra air intake beneath the front bumper to accommodate the larger radiator. There was no longer space under the bonnet for the car's battery, which in the 3500 retreated to a position on the right side of the boot. Nevertheless, the overall length and width of the body were unchanged when compared with the smaller-engined original P6.