I'm the guy on page 99 with the mini Spintron. I'm currently testing one of Jay Brown's Dove heads and yes, there are indeed some issues with it. Here's a little video clip of a rocker shaft bolt pulling out at 10,000 rpm (no, that's not a typo - TEN THOUSAND!)
http://s140.photobucket.com/albums/r...Spring1000.flv
The smoke is from
oil hitting the very hot valve spring. Once the bolt pulled out,
oil really started gushing out and created a cloud of smoke. I was able to shut down with no permanent harm done :-)