I did back to back grooves testing on my dyno.
Enigne Dyno Grooves Testing
For what it's worth this guy took the before and after grooves sound files and analyzed them;
The Groovy Sounds of a 360 Magnum Engine
I made a large mistake by not nailing down BSFC with steady state tests - I will do that next time. Also I'm planning on recording engine noise with a contact microphone setup and maybe a knock sensor to see if the grooves actually cut down on detonation. I'm very slow though so it might not happen for a while.
For the first time I understand how grooves aimed at the exhaust valve might help inhibit reversion. Did that car have a full exhaust? It's not too hard to build engines that will not have reversion at WOT anyway, when the VE goes over 100% some of that VE can be airflow that is not "trapped" and is blowing right through the engine thus there could be little or no WOT reversion.
So using grooves to limit reversion at idle or low RPM/low throttle would limit their effectiveness at doing anything good at WOT right?
(Thinking) - if there is no reversion at WOT why waste the groove for reversion control?
I'm wondering if for detonation control groove(s) should be aimed at the outside of the intake valve where the intake valve meets the cylinder wall as this seems to be where detonation starts.