Sounds like its galloping 

We just started on this Z06 and since the forum is a little slow on projects I thought I would post a build thread to follow it's progress....

My baby my baby turned 5 months old Friday and turned 5000 miles today

Another productive Saturday. Cleaned, sandblasted and installed the oil pan. Pressure washed the engine bay to get ready for paint. ...

Had a look at the old one. Not good. Now there is a big difference.

Just a little 4 Cylinders

Engine is stock except for bolt on's and tune, 41, 000 miles at this time, future plans are for srt forge wheels.