Its a 400 SBC with a 6-71 blower, was running fine, but needed crank replacing due to wear on nose which caused pulley to be loose.
While replacing the crank i had the rotating assembly balanced, however they did not seem to know what they were doing and I had to get Real Steel to talk to them to explain what to do!!
Now its all back together Ive got it running, but its shaking and vibrating worse than any engine Ive seen.
Of course I strongly suspect that they have messed up the balance job.
But before I pull it all out and strip it down AGAIN, is there something I'm missing?
I need to set the timing more accurately, and i will check with temp gun that all 8 are firing, and go over the firing order again. Hope to do this today, but i dont think any of that is going to stop the shakes!