A small block will come in around 45 Kgs heavier then the L Series and you lose 25 Kgs at the front if it has an aluminium radiator and intake manifold. Brake fade is what them measure which requires the vehicle to stop from 60 to 0 20 times in a row at .65 Negative G's and then a 100 to 0 at .8 Negative G's (from memory, may vary a little). I doubt if anyone here has ever done such a brake test on a stock Zed braking system