I watched a couple sessions of TAD at Pomona from the grandstands for a change. The alky dragsters were zinging the rpms on high "C" while the AFD's sounded like they were just cruising. Teams are telling me 60-80 runs on the rods and pistons, and 100+ runs on the cranks. This is coming from the 5.20 AFD teams. They buy a set of valve springs over the winter to get them through the next year while we buy them by the pallet.
Having said all that, I would like to see this option available. Bucky Austin and several others have stated that this would be of interest to them. It would definitely reduce the cost once the switch is made and reduce the rate of valve failure related ka-booms on race day. If we would have stayed at 125% over the valve train related failures would have been a lot lower, but now we have to buzz the heck out of them to run hard and I don't see the overdrive rule ever going back.
Right now many would say TA/FC has no parity, anyway. So why not? I'd love to give it a try.
RG