Our C/SA big block Barracuda has never spun on the M/T 30*9 radials either, but it is a very good working car. I have had it out and bracket raced it some too so it's possible to never have a issue with the radials. I just like to give guys who are thinking about switching over a little disclaimer on the things we have learned. The switch from a bias to a radial is usually good for a solid .10 faster e.t. as well.