Out of curiosity, what does it take to get a stock 5.3 to 400 lb/ft of torque? I'm not doubting that LS motors are the way forward. I'm a 350 fan simply because they're cheap. Also, I'm hopeful that my stock-headed, 4.000" bore 350 with a cam and springs is around 400hp once it's tuned. Everything I've read says yes.
At the crank it can be done with just a cam and valve springs, but people will still complain about where the peak is.
Edit to add headers and supporting mods, blah blah blah.
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