C-20 Mileage.

[Dtech]

Hey guys. I'm still a newbie to this forum. I have a 69 LongHorn and just recently put in a fresh 350 with standard flat top pistons, 64cc chamber corvette heads and an RV cam with .465 int/exh lift. Edlebrock Performer Intake.

But whats getting me it the MPG, currently it sits around 5-7. I got a Holley 4160, 600 cfm man choke, vac secondaries (I think). I have a #64 main jets, 31 acc nozzle and the idle air, acc pump and bowls are properly adjusted. The timing is stock HEI set at 8 degrees, cam spec sheet is 7. Also the trucks got a T400 and 4.10 or 4.11 gears (I'll confirm 2mrw). The truck starts fine, idles fine and performs fine (but less than what I was expecting)

I would love to see 10 or 12 MPG out of this. So my questions are. What are other ppl getting in there C20s, should I switch to an Edlebrock with inherently smaller primaries, is this normal, or am I doing something wrong.

Maybe thats why is has 70 gallons of fuel tanks on it.