RE: To Delta or not to Delta that is the question!
The MB .40 powered racers just made big news at last years World Champs for hitting 210-211.....but that's with a MB .40, not a Nelson .40.
I got a SD up to 202 which is .975xxxx of the number Henry told me back in 2006, when I asked him at the time if he thought one of his engines could get a Diamond Dust past 200.
I've also taken a K&B 6.5 Formula One engine and did 177 mph with a scratch build DD. This speed is "right there" with what the most advanced racers were hitting back in the day.