Charles, I wasn't asking for agreement or otherwise, and I can't recall saying that an airleak will not cause a sieze. Quite the opposite in fact. What I was saying is that it's possible that there's been motors built that weren't leakdown tested, and a dodgy (leaking) insulator was fitted which then caused a siezure further down the road. So we're both saying the same thing.

As for the RS's. Probably built over 100 when I worked for Harc-Pro. Never had a problem. Every engine was leak tested and almost all dyno'd.