From my research, 6.0s are $400-600 more than their little brothers. I know I'm only sacrificing 20-30 hp/tq with a 4.8 over a 5.3. Last 4.8 I found was in a totaled box van with only 48,000 miles on it. Would have been an excellent donor but the guy wanted $1,800 for just the motor and wouldn't come off the price. Only junkyard around here I trust, they want $900 or more for any LS motor, but at least they'll hook them up and show you they run.
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'11 GT Kona Blue Brembo
"Measure with micrometers, mark with a scribe, chop with an axe"
"I'm not new to driving. I've been doing it for a couple of years now." - Aphex