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Re: 5.3 or 6.0 in my 1970?
I'll chime in on the gas mileage thing just for reference. My last tank was about 60% highway at about 70-75mph. I got about 13.5 mpg. This is with the 6.0L, 38x15.50 tires, and 5.13 gears in a heavy ass Suburban. I gained about 2 mpg with the 5.13's vs 4.10's that I used to have. I would highly recomend the 6.0 over the 5.3, so much more potential for cheap.
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1971 Suburban 4x4, LQ4 6.0L, 4L80E, etc.
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