the 660's are a little bit longer than the YFZ450 shocks, when people put the 450 shocks on their raptors it lower the front end about an inch. i seem to remember a few people putting the 660 shocks on their blasters and having them ride like sh*t. i don't think i would waste my time the 660 shocks are not very good, if i wasn't laid off i would have replaced mine a long time ago, and keep in mind that the 660 shocks were valved for the 660 which is something 150+ lbs heavier than the blaster so unless you are 300lbs i think they would be way to stiff.