383 Gas Mileage?
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Joined: Jan 2013
Posts: 86
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Car: 1985 Camaro Z28
Engine: Work In Progress
Transmission: 700R4/2200 stall/Shift Kit
Axle/Gears: 7.5 Richmond 3.73/Gov Loc Posi
383 Gas Mileage?
Ok I know this a stupid thing to ask because "gas mileage isn't supposed to matter" but I am still really curious on what my 85 would get if I put a 383 in it. 9.5:1 compression
With dart SHP heads (180cc/ 64cc), a roller cam (233/241 @0.50), weiand x-celrator intake (2000-6500), a holley 750 DP.
The transmission is a 700R4 with a non lockup 2200 stall and 3.73s in the rear on a 275/60/15
Also the car is gutted except two front cloth 4th gen seats.
With dart SHP heads (180cc/ 64cc), a roller cam (233/241 @0.50), weiand x-celrator intake (2000-6500), a holley 750 DP.
The transmission is a 700R4 with a non lockup 2200 stall and 3.73s in the rear on a 275/60/15
Also the car is gutted except two front cloth 4th gen seats.
Last edited by Camaro199677; Mar 19, 2014 at 08:39 AM.
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Joined: Jan 2014
Posts: 412
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From: NJ
Car: 90 formula, 89 formula 350 vert
Engine: 305, 355
Transmission: T5, t56
Axle/Gears: 3:45 9 bolt, 8.8 3:73
Re: 383 Gas Mileage?
Not much, maybe 15mpg if your lucky. Having no lockup and 3:73 gears is what will bring gas mileage down. I have a non lockup 700r4 and 3:70 gears and I was getting between 12-14 mpg. How well your carb is tuned will also make a difference.
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Joined: Dec 2002
Posts: 1,592
Likes: 31
From: IL
Car: 1988 Formula
Engine: 421 Little M block
Transmission: TH400 w/brake
Axle/Gears: 9" 4.30s, Wilwood discs, 28X10.5-15
Re: 383 Gas Mileage?
well it is a valid question for a street car.
My 383 got 12-13 mpg. Driving it spirited... I never checked mileage driving it normally.with a 700R4 non-lockup converter & 3.73 gears.
Pretty similar combo to yours, except I had projection 4Di.
So yes 12-13 mpg with a 15 gallon stock fuel tank = 180 mile driving range.
My 383 got 12-13 mpg. Driving it spirited... I never checked mileage driving it normally.with a 700R4 non-lockup converter & 3.73 gears.
Pretty similar combo to yours, except I had projection 4Di.
So yes 12-13 mpg with a 15 gallon stock fuel tank = 180 mile driving range.
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