Just watched it for a 2nd time, it might be the audio but , doesn't sound like valve float to me. I see he's got the programmable box I set up plugged in. On those boxes you set the Rev limiter on the laptop it's pretty cool, unless he hooked a laptop to it, he doesn't know what the base timing should be, or the shape of the retard curve-yes that's what it's called, and he also can't see.....Guess what? The REV limit. I wish I could remember but I think it was 6200-6300 rpm. Fun fact...Superflow dynos like mine and Nick's and @PRH Use an optical pickup on the absorber input shaft. Why is this important? Because every time an ignition based Rev limiter is used, it kicks in 100rpm to 150 rpm sooner. So if you set your Rev limit @ 6000rpm with the ignition and then you set the dyno test range from say XXXX starting RPM- 6000RPM, during the pull, the rev-limit will begin kicking in around 5850-5900rpm. This is what it sounds like to me in the video. Food for thought. J.Rob
P.S.I wanted the customer to have access to his full 6000rpm which is why I likely set it to 6200-6300 rpm. Can the valvetrain handle more? Most likely with the RBRE/T&D shaft rockers, ISKY tool room springs and solid roller lifters. At the 700+HP level, this customer was not interested in MORE.