Yes. PER AMA Rulebook the limit is 50" at the widest part. Even if your local track runs outlaw non sanctioned stuff they generally use the AMA rulebook as a guide. if you are doing OVALS only you can take your spacer out of the left rear tire to offset the spacing (shorter on left side of axle vs. right side) which will make it look like the sprint cars do. it will help with the left hand turn stuff... if your doing TT you should look into shorter spacers for both sides. USUALLY at the track during tech inspection they have a gate or post that measures 50" wide and you have to drive through it then pull your kill tether switch. if you don't pass through it cleanly u can't start the race until its within specs. and if your kill tether doesn't work you can't start till it works. so i would look into your local track rules before you show up.
