I am a strict believer in obeying height requirements, but I wonder how strict they really are. My son was 52 inches EXACTLY, not a bit over or under this summer. However, he was not measured (or even glanced at) once on our whole trip. He did Hulk and Dueling Dragons. I find it hard to believe that the employees can tell just by looking at him that he was tall enough.
The same thing happened with my daughter last year at Disney. She was exactly 40 inches, and I nervously measured her every few days before our trip. We went on Test Track first and I had prepared her that they may say she was not tall enough. We walked right on by and I actually had to ask them to measure her because it was her first "grown up" ride, and I was nervous. She was never measured again on that trip.
Maybe the ride attendants can tell just by looking, but I would trust your own measurement at home and go by that. JMO