Dodgeman.

I think you answered my question on the strange vibrasion at 5500 to 5800 rpm!!

I think it IS the engine's harmonic frequencies.
Why I say that and please correct me if I am wrong.
It only is in the range of 5500 to 5800 and then it goes away and that strange oval feeling comes from the gear lever.

My questions then is: How does the other guys get 7 to 8000rpm out of their engines!!
Will balancing it remove these harmonic frequency?
Not that I am going to do it, just curious.

My clutch is going to be removed soon.
I am then going to lighten my flywheel.
Will balancing help with these strange vibrations?
I think I am then also going to let them replace all bolts holding the flywheel.Just to be safe.