@Ceseuron posted:Well, we just got word back from the engine builder and we may have found the problem. It looks like the wrong flywheel did get installed and the one that's in there has a 28oz weight on it for an externally balanced application. So back the car goes, trans comes out, and the correct neutral balance flywheel goes in the car. From there, we're off to full chassis dyno for final tuning.
When you find something like this, that is evidence of incompetence, you need to check everything. Assume nothing is correct. You likely have more than one problem. Start with the crank damper. Rick’s suggestion is important too. Check that the motor mounts are installed in their correct locations, assembled correctly and that they’re tight. Move on to the ZF mounts and make sure they are shimmed properly, etc., etc., etc. It might be easier to ship the car to someone like Don Byars in Los Angeles and let him go through it.