Or the crank is bent.
Interesting. I've read about the speculations of running lightened components with stock harmonic balancers that are "tuned" to work with the OEM rotating assemblies causing things to be out of harmony at certain RPMs, but never actually heard of a failure like this.
the beast runs! I still need to get a video of it but i got up early, went to the shop and got it running right. I still need to tweak the fueling up top and fix some minor things but she is running.
It sounds so damn nasty, it was worth it for the sound alone. I am happy
cant wait for the video!