As I said, tongue in cheek!!!
I will cerainly not belittle the efforts/time spent/dyno experiments of Axtell, Branch and others in making my beloved side valve go a bit further. Bit too far away here in GB to find the article you mention.
But from what you said in the 1st post, I deducted, wrongly or rightly?, that the flat top piston wasn't suitable for the flow improvements discovered, hence the use of dome ones.
There aren't many guys alive today who still think in terms of side valve tuning.. I met a few old guys in my time, and did pop the question to them, flat top or dome... Most of their answsers can be summed up that it don't matter too much as long as the sacred shelf remains. That's why I noted above that getting rid of the shelf in the dome experiment wasn't probably a smart move.
The dome top still had its day, Dan Haaby still raced his during 1970 with some success if not outright wins... I can't neither deny that the dome came too late due to change in AMA rules, so did not have the time to get properly sorted. Given a few more years and given O'Brien and his crew's tenacity, no doubts we would have seen better results...
But, back to the delayed race in 69, what I read between the lines is that all the factory top guns reverted to the flat pistons/shelf heads during the god sent week's delay, that must surely say something.
As for who owned what in the good old days, I'm stuck in GB, a bit far away for decent research, so do wish some of you guys in the States that value the KR effort for what it really was, a damn good effort considering the odds stacked against it, to do your home work and make it public for all to enjoy and savour.
I particularly appreciated in the recent past the 54/69 GNC book by Gregory Pearson, what an smart single handed effort!!!
KR mad Patrick