I always use a 1/2" impact wrench and the bolt begs for mercy when it sees me coming... then quickly submits. No stopping an Ingersol Rand 1/2" impact with 170PSI.

Love the Vette by the way... Always been a fan of 50+ year old cars. Check out my web page and visit any of the links that start with 2004 if you don't believe me. There are a few Vettes in there... like some '65 fuel injected cars and the Mako Shark...