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383 milage

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by CaptCrunch, May 10, 2001.

  1. CaptCrunch

    CaptCrunch 1/2 ton status

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    I just got hit up with a pretty good question from a buddy of mine... For you guys running 383's... how did the mpg fare with the swap? I know there are a lot of variables to mpg, but I can't say I've ever built one for street/daily use LOL. BTW he has a 94 Z71 and gets about 13 now... I figure he would be in the same ballpark or a touch lower once he gets used to the power and stops nailing it to the floor all day [​IMG]! But any imput would be appriciated.

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  2. HarryH3

    HarryH3 1 ton status Author

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    Mine's a 383 with '87 vette aluminum heads and TPI sitting on top of it. It's got a somewhat mild mid-range cam. Drivetrain is a Turbo 400, 4.10's and BFG 35x12.5x16.5 Mud-Terrains. Highway mileage is just shy of 14 MPG, running 65-75 MPH. Around town I don't check it 'cause I don't want to know. [​IMG] I do have a tendency to get heavy into the loud pedal quite often! [​IMG]

    Oh yeah, the "Smiles" Per Gallon with the 383 is off the scale! [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
    It's a great day to be alive...
     
  3. muddin4fun

    muddin4fun 3/4 ton status

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    My dually (5spd with even lower gears than stock....55mph top speed) got 8 or 9 m/gal with about 10,000lbs on it on the freeway going everybit of 55mph. LOL!

    [​IMG]
    <A target="_blank" HREF=http://k5chevyblazer.homestead.com/home.html>http://k5chevyblazer.homestead.com/home.html</A>
     
  4. CaptCrunch

    CaptCrunch 1/2 ton status

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    Hahaa! That is kinda what I said, but he is one the people yelling about the gas price being $2 a gallon. I figure myself the heck w/ it... I'm not gonna be happy driving a econo turd so might as well drive what I want [​IMG]. Basically his engine is the same as mine... has 150 -200k on it... leaks from the rear main, valve seals are shot so figure now is a good time to just bolt in a new motor. Plus I told him there is no way in heck I'm doing Valve seals on the truck... My back would be shot halfway through cause it is sporting 35's and a 6" IFS lift. Daddy will pay for his motor (with'n reason... guess he found a stock replacement at the dealer for 1500) but he has to pay for the gas in it. I tell ya life must be rough for him [​IMG] Heck my old man wouldn't even get me a pack of Wrigley's doublemint once I turned 15... just said "GET A JOB YA MOOCH! I'm kicking ya out the day ya turn 18... AND TAKE OUT THE D@MN TRASH!!!". LOL... It's the truth!

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  5. muddin4fun

    muddin4fun 3/4 ton status

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    Ya, take out the d@mn trash WHILE you're leaving!!! I know the feeling. LOL! It's sorta a gas guzler, but not as bad as a big block. Inbetween a 350 and 454.

    [​IMG]
    <A target="_blank" HREF=http://k5chevyblazer.homestead.com/home.html>http://k5chevyblazer.homestead.com/home.html</A>
     
  6. WOODYJ

    WOODYJ 1/2 ton status

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    I am running a 383, mild cam (melling MTC1), 700R4, 373 gears, 31x10.50-15's. I run dual fuel and get about the same mileage on both Gasoline and Propane. If I hold it between 55-65, I usually get around 15-16 mpg. Squash it and it gets less. I am usually pulling trailers or a boat and am geting this kind of mileage. At 55mph I am only running 1750rpm's, and if you run it up to 60+ about 2000rpms it seems to get a coupe of mpg better as it is getting where the cam likes to run. Hope I helped a little.

    k5woody I Don't Understand The Jeep Thing Either!!!
     
  7. Burt4x4

    Burt4x4 3/4 ton status

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    My first thought is that a 383's gas milage would be less that a 350. The reason has nothing to do with the setup or it haveing a longer stroke but the plain and simple fact that it has more power and would be ALLOT more fun to drive and the HEAVY foot factor would be GREAT so there for gas consuption would increase[​IMG]

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
    <A target="_blank" HREF=http://www.burt4x4.coloradok5.com>http://www.burt4x4.coloradok5.com</A>
     
  8. CaptCrunch

    CaptCrunch 1/2 ton status

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    Ok Boss... LOL *takes trash bag and puts on the hood of her Camaro* [​IMG] j/k... *picks it up and puts it on the J#@p next to it* [​IMG]. Yeah I figure just from the cubes stand point it will suck some gas, but w/ his stock gearing w/ 35's he should see a little benefit in town because he shouldn't (although the temptation will be great [​IMG]) have to give it so much gas to get moving.

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  9. CaptCrunch

    CaptCrunch 1/2 ton status

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    Yeah gotta love the torque of them 383's... although really the 350 TBI's aren't that bad for get up and go... better then a 305 at least LOL. The only reason I would debate between the two is $$$, but since he has a 1500 bill... why not shell out 500 or 1,000 more and get a thumpiong 383!

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  10. lehtola

    lehtola 1/2 ton status

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    I want one, I want one. Who's got a 383 that I can get at somepoint. GM was gonna put one on the market but I think they backed down. They even had literature on it, but when I went to the dealer they said it was not available...although the maketing brocure on it made it look sweet. And what about all the other stuff that would have to go into it...computer etc. I'd be interested in opinions on the matter. Would like to have a TPI set up or that edelbrock TBI to fuel injection swap.

    1990 GMC Jimmy 350/TH700R4/NP241/10 bolts, 4" skyjacker lift, 35x12.50R15 BFG All Terrains on 15x10 AR Baja's, Flowmasters.
     
  11. ftn96

    ftn96 1/2 ton status

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    MAn there are all sorts of places to get them. Paceparts.com, speedomotive.com, gmgoodwrench.com, to name a few.

    Will work for beer, parts and tools.
    90-350TBI-TCI700-241-33"-10/12 bolt w/4.10's,
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     

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