I was just wondering if I can get close to the same gas mileage with a holley as I can with a quadrajet with a 350?
Thanks

 

MY 650 Holley was getting 12-13, probably closer to 14 with, 3.08 rearend gears and a TH350. I would GUESS a car with a 700 would get 14-16. I was running a holley 6210, Its a direct holley replacement for the q-jet. Also the primary jets were 60's. I would guess this helped mileage too.
Later
John

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82 Firebird,408,Dart Iron Eagle 215's,Cam 229/239, .498/.520,TH350 Tranny, 750 Speed Demon carb, Hooker Headers(I.E. POS) Manual steering, Also a cowl for the big hole in the hood.
Shooting for low 12's.
Check out my birds new home.

 

I was getting about 25mpg with my q-jet... now that I finally have a working tach, I will be able to tell you how much I lost with the Holley 750vac.

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1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock with the exception of the Holley 750vac... all the suspension stuff... 9-bolt posi disk is in...

-=ICON Motorsports=-

 

Well i never recorded how many mpg i got with my Quadrajet but the previous owner told me 12 around town.
I would fill it up every 5 days or so.
4 days if i floored it alot
With my new Holley I floor it almost everytime i drive and don't have to fill up for a week and a half (10 days)

Not very scientific or numerical, but a big difference

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--Steve S--
1984 Trans Am 305 LG4, 5 speed
Daily Driver, Flowmaster 80 Series
Holley 600 cfm & vacuum advance

 

depends on what your getting currently?
I was getting 14 with a qjet. and with a holley 600 i got about 18. granted the qjet was triked out. you probably get better than 14 with your qjet. you have to remember that a qjet only flows 300 cfm when in primaries and 740 wo. a holley flows more air than a qjet because it dosent have the flappers to keep it closed.

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85 Camaro RS T tops 350/350, stealth intake. holley street avenger 670. ported 58cc heads. comp magnum 270H cam,Crane 1.6 roller rockers,edelbrock accu-drive, MSD 6 series ignition on HEI, K&N extream air cleaner, true dual exhaust with 18 inch glasspacks.
82 Firebird 305/250 action plus intake, accel distributer with ccs 8mm wires foam air filter.
The only "cat" i have uses the litter box

 

Properly tuned and driven the same you can get about the same. Usually a holley is set-up to run on the rich side, so mileage suffers.

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82 camaro--original steering wheel, brake/gas pedals, seats--everything else modified
82camaro