350 swap mpg????
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Senior Member
Joined: Nov 2007
Posts: 744
Likes: 1
Car: 1983 Camaro Z28
Engine: 383
Transmission: TKO 600
Axle/Gears: Strange S60
350 swap mpg????
I am putting the 350 in my car soon and am kind of worried about my gas mileage since i have been hearing gas is going up to 4.50 this summer. The engine will have lunati voodoo cam (.468/.489 lift) ported and polished 305 heads(the 416's) with 3 angle valve job. performer intake, edelbrock 650 carb, and full exhaust. what could I expect to get for mileage driving conservatively?
Joined: Dec 2005
Posts: 6,499
Likes: 31
From: Macon, GA
Car: 1992 Camaro RS
Engine: Vortec headed 355, xe262
Transmission: T56
Axle/Gears: 9-bolt 3.70
Re: 350 swap mpg????
In theory gas usage has a lot more to do with how much power you're making than displacement.
I you use a similar cam to what you have, then your gas mileage should stay very similar.
I you use a similar cam to what you have, then your gas mileage should stay very similar.
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Joined: Mar 2008
Posts: 181
Likes: 0
From: Westminster, Maryland
Car: 1987 IROC-Z
Engine: 383ci SBC
Transmission: 700r4
Re: 350 swap mpg????
I had a VERY similar setup in a car with 4.11 gears in the rear and was getting between 7-10mpg with general around-the-town drivin, but it was only a 3 speed, no overdrive so you might get more with an OD.
Thread Starter
Senior Member
Joined: Nov 2007
Posts: 744
Likes: 1
Car: 1983 Camaro Z28
Engine: 383
Transmission: TKO 600
Axle/Gears: Strange S60
Re: 350 swap mpg????
also i dont live in a city so its lk 45mph on average with few stops and i just leave it in 5th. so my mileage might be a little better. idk, hopefully 13 or so.
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Joined: May 2004
Posts: 2,924
Likes: 1
From: Kingston, Tn
Car: 1987 GTA
Engine: LT1
Transmission: T56
Axle/Gears: 9 bolt 3.70 posi
Re: 350 swap mpg????
45mph and the 3.73s in the car it will be crappy because you'll be lugging the motor. If you're concerned about fuel milage, ditch the 305 and 5-speed, put out the money and get an LSx series motor (5.3, 5.7) and a 6-speed and you'll probably almost triple the milage (an LS1 putting 500 at the wheels can still get 30mpg with a 6-speed and 3.73 gears.)
Joined: Feb 2007
Posts: 632
Likes: 6
From: college station, texas
Car: numerous
Engine: ls1, others
Transmission: t56, others
Axle/Gears: 3.23 7.6"
Re: 350 swap mpg????
Also about millage:
Originally Posted by 1bad91Z
Over the last few months, I've been averaging close to 19 MPG in the city with the red Z. I just finished the first full tank of gas after installing a MSD Blaster GM coil and a set of March performance billet underdrive pullies (crank and alternator). I just averaged 20.73 MPG in the city and that was even stepping on the gas (having fun) half of the time!! I might be able to squeeze a little more if I baby the car for the duration of the whole tank! Oh, and the adder power was a noticable difference too!...
...the motor in the red Z makes atleast 360 HP at the flywheel...
...the motor in the red Z makes atleast 360 HP at the flywheel...
Last edited by yevgenievich; Mar 31, 2008 at 09:55 AM.
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Ditch the Edelbrock carb. Bad idea, both for performance and economy. Total waste of performance $'s.
Keep the stock carb. I typically get 18-20 combined MPG. It'll do better sustained highway, but it doesn't see much of that.
The only excuse for a different carb is manual tranny. Even then, the Edelbrock is the wrong choice - either double pumper, or keep the stock q-jet. If economy is a concern, the q-jet wins again.
Keep the stock carb. I typically get 18-20 combined MPG. It'll do better sustained highway, but it doesn't see much of that.
The only excuse for a different carb is manual tranny. Even then, the Edelbrock is the wrong choice - either double pumper, or keep the stock q-jet. If economy is a concern, the q-jet wins again.
Joined: Apr 2003
Posts: 1,230
Likes: 2
From: Madison, WI
Car: 1986 Camaro Z28
Engine: 400
Transmission: T5
Axle/Gears: 10 bolt Posi 3.73
Re: 350 swap mpg????
Like 5-7 said, a double pumper will slaughter your gas mileage. This I know, as I've got one on my engine. I couldn't imagine daily driving my car. I use premium gas. I would run out of money.
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Joined: Aug 2007
Posts: 206
Likes: 0
From: maryland
Car: 91 maro
Engine: 350
Transmission: 700r4
Axle/Gears: 373 locker
Re: 350 swap mpg????
i began with a 305 tbi got 22 miles to gallon easy on gas stock.put gears stall built trans.19 maybe put a stock 350 under stock tbi with headers better gas mileage like 20.put 383 with all goodies and carb 10 foot in it or not horrible on gas.but very fast lol
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: 350 swap mpg????
If you're worried about gas mileage you shouldnt be modifying your car with a bigger engine and more power. Sorry to be harsh.
I just dont care about it. Forget MPG, I want my MPH! For the record, I get 25+ miles per gallon on the highway, and about 15 in the city. But I have fuel injection, and I tune the computer myself.
I just dont care about it. Forget MPG, I want my MPH! For the record, I get 25+ miles per gallon on the highway, and about 15 in the city. But I have fuel injection, and I tune the computer myself.
Thread Starter
Senior Member
Joined: Nov 2007
Posts: 744
Likes: 1
Car: 1983 Camaro Z28
Engine: 383
Transmission: TKO 600
Axle/Gears: Strange S60
Re: 350 swap mpg????
yea, i would rather have a fast car then get 30 mpg, bein able to smoke all my friends with 4 cylinders makes it all worth while... but bad gas mileage does suck. lol
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