Did a run on the dyno and found an oil puddle under the car. Drove home and found that the bolt had backed out and the pulley had moved forward about 1/4 inch. There were just a few drops after the drive home. Do yo think my seal will need replacing. and if so, has anyone replaced one without removing the cover?

 

it happend to me also, same thing after some 1/4 mile runs. Did you remove the bolt at any time? if you did you need to replace it with a new one and it well fix your problem.

 

Ya you will have to remove the balancer and replace the seal. And either use a NEW OEM bolt or the ARP bolt.