BTW- you'll need a wrench with at least 2feet of extensions to get to the exhaust manifold bolts and I'd allow (expect) 30-40 minutes to just unplug the O2 sensors- I'm talking about the electrical connections, not taking the sensors out of the exhaust... Chevy engineers are sadists, I swear!
And the articulated adaptor at the end of the wrench will really decrease your likelyhood of rounding off those bolts!
