Okay so I am in the middle of a build and am just kinda wondering what to expect for mpg when I start driving this thing everyday. Here are the specs:

Stock L98 bottom end
Comp Cams 268xfi Cam Duration 268/276, Lift .570/.565
AFR Eliminator 195cc heads 2.02 intake, 1.6 exhaust, 65cc chambers.
Fully Ported TPI intake
22 lb injectors

 

With a 4000 stall, a 2-speed powerglide transmission, and 5.30 gears, about 6 mpg.
It also depends a lot on who tunes it...

 

oh I almost forgot 200-4r trans and 3.08 gears.

 

i'd estimate pretty good mileage for that setup with a proper tune. shouldnt be all that much off stock which is 16-17 mpg city and 24 highway but it could be better based on how you drive and how its tuned.

its gonna get better mileage than my 383 thats for sure there are a few guys that used similar setups so hopefully they will chime in. burnout91 or something like that has that setup