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Originally Posted by 68C15
so what kind of highway mileage is to be expected from a stock 500 & 3.08:1 gears?
you guys have got my attention on this swap.
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I found the 500 to be way better on gas than a chevy 350. The motor hardly
has to work. With a load there is no comparison. I took a trip with a full load,
8' slate pool table plus other stuff over 750 miles and used 45 gals. of gas.
that comes out about 16.5 miles to the gallon. The truck has 410 gears and
half the trip was empty with a cap on the whole trip. I would like to see a chevy motor do that with a heavy load! The 350 was lucky to squeak out 12mpg. Plus the fact on takeoff you can surprise v-8 stangs. I think that GM
put there best truck motors in car body's. I also had a 425 olds big block in a 79 shortbed. A great combo for a drag racer pull truck. Not as good as the Caddy but still a nice BB. This short ran the 1/8 mile at 9.2 spinning the tires
half way down the strip. Of coarse this was not my drag vehicle, bunch of us wanted to try out our pull trucks. Any BB is a great transplant, just do it and have more fun than ever! Mike
SEE POST TEN for the 500 caddy PIC thanks to c-10ss500