Originally Posted by DrCharles
Originally Posted by volaredon
big block, big cam, double pumper..... geez what do you expect?


From my original post:
Quote
I suppose I shouldn't be surprised because big cams are not known for economy, but still...

Since I got 8 to 15 mpg from a mild 383 with 3.23 gears, I figured 6 to 10 with this one.
Well, I'd like to get 10 mpg on the highway at a steady 60, since I already know it cruises nicely at 15-15.5 AFR there. We shall see wink


An overdrive would change your world.

Spinning 451 cubes at 3,000rpm still requires a substantial amount of fuel to obtain 15-15.5 AFR, the shear volume of air you are pumping per minute is substantial.

The amount of fuel you need to run at that rpm is probably what my little Hemi consumes at 100mph in 6th.

1972 Barracuda - 5.7L Hemi, T56 Magnum 6spd - https://www.facebook.com/GoodysGotaHemi
2020 RAM 1500
[img]https://i.imgur.com/v9yezP9.jpg[/img]