i just did the swap to carb on my 79 302 its now got a holly 600cfm carb vac secndaries .how much mpg could i get if i take it easy and its tuned properly .??

 

Depends on the engine setup, vehicle weight, and other variables. My f-150 with a brand new holley 600 vac sec, Edelbrock intake, headers 9.5:1, Comp 270h cam OD tranny 3.50:1 gears 28" tires got 19 mph freeway, with a good carb tune and the truck weighed 3750lbs.

 

ok thanks how many mpg would i be giving up from going to carb from efi

 

depends on how you drive it and how your carb is tuned, but id say at least a couple MPG's.

 

I get 8 mpg in my truck......but thats performance, can't have it both ways.......