the blocks are for arm sweep you can run arm sweep which can how the car conners. lets say you run hpi 0 fr and 1ff you would have one deg. of arm sweep then you set the toe you what you want. this is for the front, on the rear the blocks do control the toe. you should check the hotbodies cyclone thread and look for koreys arm sweep post. but it is something to try and play with. the same concept is ture for tamyia. also changing the front block can also change the front track width. but front block should not be used as toe adjustments those should be made with the turnbuckles.