Any I-6er\'s out there? Just wondering, we always seem to talk about SBC, BBC, diesels, and even big Caddies, I know some of the earlier K5's ran in-line 6's (maybe this was only 2WD?). Is any one running a I-6 in a K5? What type of milage and performance are you getting? Just thought it'd be interesting to find out. It's not what you buy, it's what you build!