Timing was my thought as well. I will check the balancer, it is only a year and half old, but that probably doesn't mean anything. I know the bolt is tight, I check that on a regular basis, since the last one came loose. There was no problem until the new dizzy. I am guessing that something has gone wrong with the encoder or the sending unit on the dizzy. I am just afraid with the manifold as hot as it was, I have done irreparable damage to the head and the valves. I am not saying it is not the balancer, but it seems odd that it only surfaced with the new dizzy. I am going to be bummed if I have killed the head. If the balancer has slipped, then the bond between the inner and outer rings has failed. Isn't it inevitable that the outer ring will now slip off at some point? What are the odds the valves and the head survived this? My only hope is since the coolant temp did not get up, the head was kept cool. I have never had something like this happen, so I really don't know if an aluminum head can even survive this??!