cam, singular
well theres a few options for the D16z6 motor r.e cam choice, some seem to give good results, but at the end of day, its still gonna struggle to go much over 140mph,
and will take loadsss of boost and timing to do it, which will mean high torque, and probably lots of breakages.
now the B16`s are 13mm shorter stroke, which is lot, the b16 is about the shortest stroke car engine around, the geomatry is closer to a bike engine really, which means more revs, less torque, more HP. which should mean less breakages for 1, and less traction problems to overcome which may mean we can stick with the small 23" tyre for longer. also with 2 cams we have more scope for adjustment with the motor (overlap etc), and the B16`s go as fast and faster than the D16`s at half the boost! its just a much more efficent motor, we always knew it was the better motor, but wanted to try the D for the cheapness, and love of the underdog
but if we want to be anywhere near winning the championship next year, we need to be aiming high, and quite simply i dont think the D has the potential to take the win, the B certainly has, though it still wont be a walk in the park chasing guy chamberlin`s 150mph type R