New Carb.

Discussion in 'Trucks and Trailers' started by Spence, Jan 1, 2001.

  1. Spence

    Spence LawnSite Member
    Posts: 62

    I have an 83' K10 with a 350. It has the rochester quadrajet carb. I was planning on replacing it. If I replace the factory carb. with a holley or edelbrock, would it have much of an affect on the gas mileage or would it be about the same? What would the price difference be between the factory replacment and the performance carb.?
     
  2. Jeff's Classics

    Jeff's Classics LawnSite Member
    Posts: 78

    Depending on the condition of your current carb, the gas mileage would probably go down with a replacement Holley or Edelbrock. These carbs typically have larger primaries than the QJet and are not designed for economy. The replacement QJet would probably be about the same as what you have, but they are a standard replacement for many different engines made by GM, so may not be calibrated specifically for your engine.
    Have you considered a high-quality rebuild of your original carb? It was designed by GM engineering to match your engine combination and will most likely provide the best economy and drivability.
    Jeff
    http://www.jeffsclassics.com
     
  3. Spence

    Spence LawnSite Member
    Posts: 62

    Jeff,

    I thought about rebuilding it, but it has already been rebuilt once. Would it be worth rebuilding it again? The engine is not the original one. It came from the factory with the 305 and the guy I bought it from rebuilt the 350 and dropped it in.
     
  4. fran

    fran LawnSite Member
    from iowa
    Posts: 13

    I JUST INSTALLED A EDELBROCK 600CFM W/ELECTRIC CHOKE. RUNS GREAT. AS FAR AS THE GAS MILAGE I COULDN'T TELL HAVE ONLY HAD IT ON FOR A COUPLE OF DAYS. IM AFRAID TO CHECK. AS FAR AS COST IT WAS 230 FOR CARB, 20 FOR ADAPTER PLATE, 20 FOR NEW BREATHER AND FILTER, FUEL LINE AND FILTER 20=290. A EDELBROCK REPLACEMENT Q-JET WAS AROUND 550, I SPENT LESS AND AM VERY GLAD I DID. LET ME KNOW WHAT YOU DO.
     
  5. fran

    fran LawnSite Member
    from iowa
    Posts: 13

    BY THE WAY MY 350 HAS BEEN REBUILT A FEW YEARS AGO AND THE GUY I BOUGHT IT FROM SAYS IT HAS A STEEL CRANK AND A RV CAM.
     
  6. Spence

    Spence LawnSite Member
    Posts: 62

    Price is the reason that I asked that question. For a replacement factory carb, it would cost around $500. I know that a Holley or Edelbrock is cheaper, but I was told that it would kill your gas mileage. Not sure what I will do.
     
  7. fran

    fran LawnSite Member
    from iowa
    Posts: 13

    I WAS ONLY GETTING 7 MPG ANYWAY. AND THAT WAS WITH THE PLOW OFF THE TRUCK SO I FIGURED FOR THE PERFORMANCE INCREASE WHAT THE HELL GAS IS CHEAP(HA HA).
     
  8. MTCK

    MTCK LawnSite Senior Member
    from Idaho
    Posts: 254

    One rig I have has is a 4x4 '83 half ton with 700r4, 2.73 gears, 32 inch tires, a 305 with about 100,000 miles, that still gets up pretty good, with an edlebrock performer 650 carb and dual plane intake that gets just as good as mileage as the old quadrapuke, steel EGR intake did, with a little more power, and better throttle response. Now I'm running Hedman Headers with dual 2.5" pipes and flowmasters. I'm sure that helps a little too........
     
  9. Spence

    Spence LawnSite Member
    Posts: 62

    MTCK,

    If you don't mind me asking, how much did that Edelbrock 650 cost? Cost is my biggest concern. I need to do something soon because the carb. on my truck now is in bad shape. It drinks gas like crazy.
     
  10. MTCK

    MTCK LawnSite Senior Member
    from Idaho
    Posts: 254

    I was wrong. I have a 750cfm on mine, which is a bit much, but I was planning on dropping in a hot 383 at the time, so it seemed like a good idea. I bought the carb from Summit Racing for about $210. That's a manual choke model. Summit has an online cagalog at http://www.summitracing.com and the prices are : 500 cfm manual choke - $206 600 cfm electric choke - $228 600 cfm electric choke and EGR $250 600 cfm manual choke - $200 (good bet) 750 cfm electric choke is $270. Good luck. Also I think you'll need an adapter plate to put a square bore carb on your spread bore intake, unless you replace that too. (non emission dual plane edlebrock performer is right around a hundred bucks.) Good luck
     

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