A friend is building a Birkin in Australia, with a 2.0L Duratec. He has been recommended to fit either of the following cam set-ups, for road and sprint use, but is worried about drivability on the road. Does anyone have experience of these profiles, from Ultimate Performance, or can recommend alternatives?
1. UL39/UL40 – 12.5mm x 302 degree inlet cam, 12.0 x 294 degree exhaust cam.
2. UL46/UL47 – 13.5mm x 302 degree inlet cam, 12.7 x 294 degree exhaust cam.