Re: 1968 C10 5.3 swap, the easy way.
My 68 firebird with 4.10's, t56 and the 6.0 in that got 24 on the highway. These trucks are not aerodynamic in any way. My firebird would cruise at 90mph no problem. My truck needs a lot more gas input to maintain the higher speeds. I changed cams in the truck and got 17mpg on my last trip though.
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