LS6 motor mounts
There are a few drawings available on the net for your chocie as well.
The ATS LSx mounts on the other hand, were designed specifically for your application and utilize the same type stock mount. But, it is mounted upside down and it keeps the engine in its proper location and also lowers it a little without any issues. This will give you more room for the transmission of your choice and slightly improves the CG.


