As for the power loss...I can’t say. You’d need several days on the dyno to sort it out. I do know a friend was running a gear drive and he almost couldn’t sleep at night because he was worried about his valve train getting killed, even though we looked at both our stuff every winter and never saw a thing.
I am guessing the more agressive the overall engine build, the higher the POSSIBILITY of damage from harmonics. Like you say, it would take a lot of testing .
I have also changed cams, springs, pushrods in the combo. So there is no way for me to verify anything.
I due run a good damper. ATI Superdamper.
