383 sbc gas milage
10-30-2008, 08:35 PM
#1
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Car: 85 camaro z28
Engine: 305
Transmission: auto to manaul
383 sbc gas milage
how much will my gas milage change from 305 to 383 sbc? its already pretty bad
Last edited by five7kid; 11-05-2008 at 11:33 AM. Reason: language
10-30-2008, 08:44 PM
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Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: 383 sbc gas milage
Depends on what gears you've got, what cam you use, what induction system you have, how it's tuned, and how you drive it.
10-30-2008, 09:13 PM
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Car: 85 camaro z28
Engine: 305
Transmission: auto to manaul
Re: 383 sbc gas milage
if everything was the same (in theory), would gas milage decrease?
10-30-2008, 10:33 PM
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Car: '83 Z28, '07 Charger SRT8
Engine: 454ci, 6.1 Hemi
Transmission: TH350, A5
Axle/Gears: 2.73 posi, 3.06 posi
Re: 383 sbc gas milage
All else being equal, it shouldn't be much different. The 5.0 TPI and 5.7 TPI ratings were basically the same, I think the 5.7 was like 1mpg lower city and hywy, 383 wouldn't be much different than the 5.7
11-05-2008, 12:11 AM
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Car: 86 TRANSAM
Engine: 406
Transmission: 700R4
Axle/Gears: 3.27
Re: 383 sbc gas milage
Mine improved from 18 mpg with the 305 to 24 mph with a 406. Check you PM's for more data.
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11-05-2008, 11:34 AM
#8
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
If you're getting poor mileage with the 305, you've got something wrong. Why would you want to build a 383 and keep what's wrong?
11-05-2008, 12:36 PM
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Car: 91 rs
Engine: Blow through 383, 10 psi, xr288hr
Transmission: Manual th350 ATI 3000
Axle/Gears: 3.50 9"
Re: 383 sbc gas milage
You may see an increase if the engine's output is increased in the area that you spend most of your rpm's. However a 350 tpi should have more than enough tq to get the car moving well at low rpms.
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